False. It is more crucial to arrange the components of a scientific process in a manner that is understandable to you than it is to list them in sequentially when modeling it.
What does the word sequentially mean?The engineers can now do their tasks continuously instead of sequentially as they did in the past. pertaining to or founded on a procedure for testing a statistics hypothesis that requires looking at a series of samples before deciding whether to approve or reject the theory or to keep sampling from each one. sequentially.
A sequential activity is what?Sequential tasks involve steps in a together that and follow a sequential order or sequence. Writing a message, creating a recognisable image, and piecing together a puzzle are a few examples of these activities.
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a solution contains 0.1m f-(aq), cl-(aq), and br-(aq). lead (ii) ion is added to the solution. what is the maximum concentration of lead (ii) ion that will allow only one precipitate to form? [the ksp of pbf2 is 4.1 x 10-8; of pbcl2 is 2.4 x 10-4; and of pbbr2 is 2.1 x 10-6.]
The maximum concentration of lead (II) ion that will allow only one precipitate to form in a solution containing 0.1m of F-, Cl-, and Br- is 4.1 x 10-8M. At this concentration, only the lead-fluoride compound (PbF2) will form a precipitate.
Lead (II) ion is a metal cation that can form multiple compounds with anions such as fluoride (F-), chloride (Cl-), and bromide (Br-). If lead (II) ion is added to a solution containing 0.1m of each of F-, Cl-, and Br-, the maximum concentration of lead (II) ion that will allow only one precipitate to form will depend on the solubility product (Ksp) of the various lead compounds that may form.
The Ksp of the lead-fluoride compound (PbF2) is 4.1 x 10-8, the Ksp of the lead-chloride compound (PbCl2) is 2.4 x 10-4, and the Ksp of the lead-bromide compound (PbBr2) is 2.1 x 10-6. To determine the maximum concentration of lead (II) ion that will allow only one precipitate to form, we need to compare the Ksp values of the three lead compounds.
Since the Ksp of PbF2 is significantly lower than the Ksp of PbCl2 and PbBr2, the maximum concentration of lead (II) ion that will allow only one precipitate to form will be the Ksp of PbF2, or 4.1 x 10-8M. At this concentration of lead (II) ion, the PbF2 compound will be the first to form a precipitate, whilst the PbCl2 and PbBr2 compounds will remain in solution.
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a gas in a closed rigid container exerts a pressure of 1.20 atm at 20.0 oc. when heated, the pressure is 1.50 atm. what is the temperature of the heated gas? provide answer in oc to the nearest 0.1 oc. g
A gas in a closed rigid container exerts a pressure of 1.20 atm at 20.0 °C. when heated, the pressure is 1.50 atm. the temperature of the heated gas is 25 °C
given that :
pressure of the gas P1 = 1.20 atm
temperature of the gas T1 = 20 °C
The pressure of the gas P2 = 1.50 atm
temperature of the gas T2 = ?
according the gay - Loussac law , we get:
P1 / T1 = P2 /T2
T2 = P2 T1 / P1
T2 = (1.50 × 20 ) / 1.20
T2 = 25 °C
the temperature T2 = 25 °C
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Which would you expect to be a conductor of electricity in the solid state? O iodine (12) O silver spoon (Ag) O lime (CaO)
Silver spoon (Ag) is a conductor of electricity in the solid state.
What is electrical conductors?Since a conductor presents little to no resistance to the passage of electrons, which results in an electrical current, a conductor carries electricity. Generally speaking, excellent electrical conductors include metals, metal alloys, electrolytes, and even some nonmetals, such as graphite and liquids, including water.An item or category of material that permits the movement of charge in one or more directions is referred to as a conductor in physics and electrical engineering. Metals are frequently used as electrical conductors in materials.Common electrical conductors include copper, silver, aluminium, gold, steel, and brass. Silver, copper, and gold are the metals with the highest conductivity.Learn more about electrical conductors refer to :
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when a h atom absorbs an ultraviolet photon with the correct energy, what transition can the electron in the atom undergo?
When an H atom absorbs an ultraviolet photon with the correct energy, the electron in the atom can undergo a transition from the fifth energy level (n=5) to the first energy level (n=1).
This type of transition is called a "quantum jump" and is associated with the emission of a photon. When an H atom absorbs an ultraviolet photon with the correct energy, it will move from its ground state to an excited state.
This excitation of the electron can then lead to further processes such as the emission of a photon or the formation of an ion-pair. Therefore the correct answer is D)n=5 to n=1 when the H atom absorbs an ultraviolet photon with the correct energy
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complete question:
when a H atom absorbs an ultraviolet photon with the correct energy, what transition can the electron in the atom undergo?
A)n=1 to n=5
B)n=2 to n=6
C)n=6 to n=2
D)n=5 to n=1
the heat of vaporization of water at 100°c is 40.66 kj/mol. calculate the quantity of heat that is absorbed/released when 7.00 g of steam condenses to liquid water at 100°c.
the heat of vaporization of water at 100°c is 40.66 kj/mol, Heat of vaporisation (HV) = q/m = 40.66 kJ/mol, quantity of heat is = 20.33 kjoules
q is heat absorbed or released , m is mass = 9 g, no. of moles of water = mass/mol wt = 9/18 = 0.5 moles, HV x m = q, uantity of heat is = 40.66 x 0.5 = 20.33 kjoule. The enthalpy of vaporisation, also known as the heat of vaporisation or heat of evaporation, is the amount of energy required to convert a liquid substance into a gas. The enthalpy of vaporisation depends on the pressure at which the transformation occurs. The heat of vaporisation is defined as the amount of heat required to convert 1g of a liquid into a vapour without causing the liquid's temperature to rise. Boiling refers to vaporisation at the boiling point. A boiling liquid's temperature remains constant until all of the liquid has been converted to a gas.
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an atom of fe has two 4s electrons and six 3d electrons. how many unpaired electrons would there be in a fe2 ion?
Two 4s electrons and six 3d electrons make up one atom of fe. A fe2 ion would have FOUR unpaired electrons.
1s2 2s2 2p6, 3s2 3p6, and 4s2 3d6 make up the electrical configuration of fe.Thus, there are four unpaired electrons in the third subshell.This demonstrates fe's paramagnetic properties.Both the 3d and 4s orbitals have almost the same energy. It's also important to note that, in contrast to the other orbitals, the third orbital has a single pair of electrons. Iron exists in two valence states, +3 and +2, as was previously mentioned. As a result, when it loses the two 4s electrons, it gets a valency of +2.
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a sodium cation is than a sodium atom. a phosphorus anion is than a phosphorus atom. a magnesium ion is than a sodium ion. a chlorine ion is than a phosphorus ion. a potassium ion is than a sodium ion.
The following conclusions can be drawn from using the periodic table to compare the sizes of ionic radii to the equivalent atomic radii or other ionic radii.
Compared to sodium atoms, sodium cations are smaller.An anion of phosphorus is bigger than an atom of phosphorus.Compared to sodium ions, magnesium ions are smaller.In comparison to phosphorus, chlorine is a smaller ion.Compared to sodium ions, potassium ions are bigger.The nuclear pull is greater for the magnesium atom since it has a higher atomic number than sodium but the same number of shells. Its size is therefore smaller than sodium's. When an electron is added to an atom to form an anion, the new electron repels other electrons, increasing the size of the ion. This is why phosphorus ions are larger than phosphorus atoms.
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What is the wavelength of electromagnetic radiation that has a Frequency of 5.65x 10¹11/s or hertz?
m
The wavelength of an electromagnetic radiation that has a frequency of 5.65 x 10¹¹ hertz is 5.31 × 10-⁴m.
How to calculate wavelength?Wavelength is the length of a single cycle of a wave, as measured by the distance between one peak or trough of a wave and the next.
Wavelength is often designated in physics as λ, and corresponds to the velocity of the wave divided by its frequency as follows:
λ = v/f
According to this question, a wave has a frequency of 5.65 × 10¹¹ Hertz, the wavelength can be calculated as follows:
λ = 3 × 10⁸m/s ÷ 5.65 × 10¹¹ Hertz
λ = 5.31 × 10-⁴m
Therefore, 5.31 × 10-⁴m is the wavelength of the wave.
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the ksp can be used to find the concentration of hydroxide ions, and thus determine the ph given a concentration of of aluminum. at what ph will precipitation of al(oh)3 begin if 3.50 lb of aluminum sulfate, al2(so4)3 , is added to 1150 gallons of water (with a negligible change in volume)?
The concentration of hydroxide ions is 0.001145 M and, the ph given a concentration of aluminium is 3.9.
(Molar mass of 342.15 g/mol).
In order to answer this question, we must first convert our units. We are given 6.70 lb = 453.592 × 6.70 lb = 3039.0664 g of aluminium sulphate.
Water in 2050 gallons is equal to 2050 x 3.785 or 7759.25 litres.
Then, using the following formula, we will search for the Concentration of aluminium sulphate:
The formula for concentration is volume x moles.
Remember: 8.8823 moles is equal to 3039.0664 / 342.15 moles. 2050 gallons, or 7759.25 litres, make up the volume.
As a result, when we plug the values of the volume and number of moles into the previous equation (1), we get;
Concentration is equal to 8.8823 moles per 7759.25 litres, or 0.001145 M.
The solubility product equation, which is what we'll utilise next today, is as follows:
Ksp = (Al^3+) (OH^-)^3.
So, we have the ksp = 1.3 × 10^-33 and the value of (Al^3+)= 0.001145 M.
Hence, making (OH^-) the subject of the formula;
(OH^-) = ( 1.3 × 10^-33 / 0.001145)^1/3.
(OH^-) = 8 × 10^-11 M.
Hence, pOH = - log (OH^-)
pOH = - log (8 × 10^-11).
pOH = 10.1
Therefore, the value of pH is; 1
pH + pOH = 14.
pH = 14 - 10.1 = 3.9.
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. absorbance readings of four prepared tubes with various solutions over a 6060-minute period. question which of the following best justifies the use of tube 22 as a control treatment? responses it was a negative control for the accuracy of the spectrophotometer, ensuring that an accurate reading for treatment cuvette 22 would be made. it was a negative control for the accuracy of the spectrophotometer, ensuring that an accurate reading for treatment cuvette 2 would be made. it was a negative control for the chemical stability of the chlorophyll suspension, ensuring that changes in absorbance could only be attributed to changes in chlorophyll content. it was a negative control for the chemical stability of the chlorophyll suspension, ensuring that changes in absorbance could only be attributed to changes in chlorophyll content. it was a positive control for the change in dcpipdcpip color associated with changes in light intensity. it was a positive control for the change in d c p i p color associated with changes in light intensity. it was a positive control for measuring the effect of dcmudcmu on the reaction.
The use of tube 22 as a control treatment best justifies that it was a positive control for measuring the effect of DCMU on the reaction.
DCMU acts as an inhibitor to the movement of electrons within the light reaction of photosynthesis. The major role of control tube is to reduce the variability due to unwanted/unknown factors of the experiment. Controls are used to make sure that test results are not positive or negative due to some unknown factor. A control group is used to establish causality by isolating the effect of an independent variable. Here, researchers change the independent variable in the treatment group and keep it constant in the control group. Then they compare the results of these groups.
Thus, the best use is that it was a positive control for measuring the effect of DCMU on the reaction.
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how many ml of 0.150 m ca(oh)2(aq) will be required to completely react with 150. ml of 0. 100 m h3po4(aq) solution.
4.86 ml are required to fully react with 11.73 ml of 1.006 m ca(oh)2 in order to complete the reaction.
provided information to be calculated:
Using Ca3(PO4)2 (s) + 6H2O, one can calculate: 2H3PO4 + 3Ca(OH)2 (aq)
cal mols
7.33 moles of H3PO4 in a volume of 1 ml are needed to replace the 2 existing H3PO4; 7.33/1.508 = 4.86.
How do moles respond to a volume increase?
An increase in volume advantages the direction that produces more moles of gas, and because there are more moles of products in this situation, the reaction will move to the right and produce more moles of products.
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if a grating with more lines per unit length were used, how would the observed angles or spread of the spectra be affected?
Grating with more lines per unit length is given by, (a + b) sin (theta n)=n ( lambda), where, a + b is grating element, the distance between two consecutive slits, n is order of principal maxima and Lambda is wavelength of light.
Consider the first order maximum on either side of central maximum. For first order n=1. Therefore ,
sin(theta 1)=(lambda)/(a + b).
If we increase the number of lines of grating, correspondingly the grating element (a + b) decreases , hence diffraction angle becomes large for given wavelength . But, then there is limit on number of lines, because sin(theta) should not become greater than 1. However, within reasonable limit on number we can get better resolution that is more angular separation of spectral lines by increasing lines of the plane diffraction grating.
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1
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18 6
In an experiment, a student found the percent by mass of water in a sample of BaCl₂ + 2H₂O to be 17.4%. If the accepted value is 14.8%, the percent error in
the student's result is equal to
3.
26
17.4
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26
14.8
-x100
14.8
17.4
x100
17.4
14.8
x100
K
[8]
Submit Answer
B
1
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The percent error in the student's result is equal to 17.57 %.
How to calculate the percent error?Percent error can be described as the difference between the estimated value and the actual value in comparison to the actual value and is represented as a percentage. In other words, the percentage error can be defined as the relative error multiplied by 100.
The mathematical formula for percent error can be defined as:
P.E. = (|Estimated value - Actual value|/ Actual value) × 100
[tex]\displaystyle \delta = \left| \frac{v_A - v_E}{v_A} \right| \cdot 100\%[/tex]
Given, the estimated value = 17.4
The actual value = 14.8
[tex]\displaystyle \delta \% = \left| \frac{14.8 - 17.6}{14.8} \right| \cdot 100\%[/tex]
Percent error = 17.57 %
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The ionic compound containing ammonium ion and carbonate ion gives off the odor of ammonia, a property put to use in smelling salts for reviving someone who has fainted.
a. True
b. False
True, The ionic combination of ammonium ion as well as carbonate ion emits an ammonia-like scent, which is used in smelling salts to revive fainting people.
The ionic compound with the formula (NH4)2CO3 emits the scent of ammonia and is used in smelling salts to revive fainting people since it contains the ammonium ion & carbonate ion.
To avoid or treat fainting, use aromatic ammonia spirit. An uncomfortable or stressful incident, a medication, or a significant medical condition like heart disease can all contribute to fainting.
Syncope, often known as fainting, is a loss of awareness brought on by a vagal reflex-induced slowing of the heart rate.
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the initial concentration of reactant in a first-order reaction is 0.27 m and has a rate constant of 0.75 s-1. what is the concentration (mol/l) of reactant after 0.75 s?
After 0.75 s, the reactant's final concentration was 0.0672 mol/L.
Log [Initial concentration] = - rate constant time + log [Initial concentration] has been supplied as the rate reaction for the first-order reaction. [Last-ditch effort]
The reaction described has:
0.27 M for the first concentration
0.75 s/rate constant
Time = 0.75 s
One can provide the ultimate concentration by:
log [0.27] = - 0.75 *0.75 + log [Final concentration]
log [0.27]=-0.5625+log [Final concentration]
log [0.27] + 0.5625 = log [Final concentration]
log [Final Concentration]=1.31+0.5625
log [Final concentration] = 1.8725
Final concentration: 0.0672 mol/L
After 0.75s, the reactant's final concentration was 0.0672 mol/L.
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calculate the mass defect in fe-56 if the mass of an fe-56 nucleus is 55.921 amu. the mass of a proton is 1.00728 amu and the mass of a neutron is 1.008665 amu, and the mass of an electron in 0.00055 amu
The mass defect in Fe-56 is equal to 0.52823 amu.
What is Mass Defect?The mass defect can be defined as the difference between the actual atomic mass and the theoretical mass calculated by addition of the mass of protons and neutrons in the nucleus.
The actual atomic mass is always less than the predicted mass determined by adding the masses of nucleons. This additional mass is due to the binding energy that is released when a nucleus is formed.
[tex]\triangle M = (Zm_p + Nm_n) - M_A[/tex]
Given the mass of the proton = 1.00728 amu
The given mass of a neutron = 1.008665 amu
The given mass of an electron = [tex]0.00055 amu[/tex]
The mass of an Fe-56 nucleus = 55.921 amu
The mass defect for Fe-56 can be calculated as:
[tex]\triangle M = (26\times 1.00728 + 30 \times 1.008665) - 55.921[/tex]
ΔM = 0.52823 amu
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on the resonance hybrid for no−2, in between the nitrogen atom and each oxygen atom there is:
N-O bond as well as a double bond. The N atom possesses a positive charge and an unpaired electron. These are the two principal resonance sources of NO2.
Because each nitrogen atom requires three electrons to fill its outermost shell, nitrogen atoms will establish three covalent bonds (also known as triple covalent) between two nitrogen atoms. Methane (CH4) is another molecule that contains a nonpolar covalent link. There are two sigma bonds and one pair of unpaired electron in nitrogen dioxide. There are an octet of electrons in each of the two oxygen atoms. With the oxygen atom, the nitrogen atom's p orbital forms a pi connectio
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a balloon is filled and sealed with air at sea level. if the balloon is taken to a city at 12,000 ft above sea level, what could be the result
As long as the temperature and amount of gas inside the balloon remain constant, the balloon will expand in volume as it flies above sea level.
When a balloon is at sea level, what happens to it?The lower pressure in the upper atmosphere, caused by the lower pressure in the upper atmosphere's upper atmosphere, permits the balloon to expand since there is less material pushing back on it.
Does the balloon's volume change, stay the same, or become larger or smaller?As the internal and external pressures become equal, the inside gas of the balloon expands because the atmospheric gas places less pressure on the balloon's surface.
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the crystal field splitting energy depends on the structure of the complex. group of answer choices true false
The crystal field splitting energy depends on the structure of the complex is a correct statement.
The energy difference between ligand d orbitals is what causes crystal field splitting. The capital Greek letter is used to represent the crystal field splitting number. The difference in color between two related metal-ligand complexes is explained by crystal field splitting, increases down a group on the periodic table and tends to rise with oxidation number. The propensity of transition metals to form complexes is one of their key characteristics. A complex can be thought of as having several ligands encircling a central metal atom or ion. Crystal field theory governs how these ligands interact with the main metal atom or ion. The interaction between a metal ion and ligand is regarded by the 1929-founded crystal field theory as purely an electrostatic phenomenon.
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Which choice is not true of a liquid in a glass capillary with a convex meniscus?The liquid has strong cohesive forces.The liquid level will be lower inside the capillary when a capillary is inserted into a bowl of the liquid.The liquid will have a convex meniscus as it moves in the capillary.The behavior of the liquid is driven by strong interactions with the capillary glass.
The decision is not valid for a fluid in what seems like a glass capillary with the a convex meniscus since the liquid's behavior is strongly influenced by its interactions with the glass.
A glass capillary is what?Glass capillaries have external sizes that range greatly, from 0.1 mm to 2.0 mm. For the purpose of gathering x-ray data, they are designed to mount, maintain, and retain biological polymeric crystals as well as small molecules. Capillaries can be used for both research on crystal development and measures of crystal thickness.
What uses do glass capillary tubes have?Glass capillary tubes are used to collect blood in a variety of healthcare settings, including clinics, personal hospices, physicians' offices, blood donation centers, and blood testing facilities.
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What is the wet bulb temperature if the dry bulb is 26 °C and the relative humidity is 77%?
The wet bulb temperature if the dry bulb is 26 °C and the relative humidity is 77% is 16°C.
What is relative humidity ?Relative Humidity (RH) is a ratio of the quantity of atmospheric moisture that is actually present to the amount that would be present if the air were saturated, expressed in percent.
In relation to the maximum amount of water vapor that the air can hold at a specific temperature. A value of 50% relative humidity, for instance, indicates that there is only 50% as much water vapor present as there would be if the air were saturated at that temperature.
Td = T - ( 100 - RH ) ÷ 5.)
where, Td is dew point temperature, T is observed temperature, and RH is relative humidity.
by using the above formula
Td=26 - ( 100 - 50 ) ÷ 5
=26 - 50 ÷ 5
=26-10
Td = 16°C
Thus, The wet bulb temperature if the dry bulb is 26 °C and the relative humidity is 77% is 16°C.
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1. Iron ores are rocks and minerals from which metallic iron can be economically extracted. Hematite is an iron ore with
the formula Fe2O3. What is the minimum mass of Fe2O3, in kg, is necessary to contain 1.50 kg of Fe?
2. Aluminum (Al) reacts with oxygen (O2) to yield aluminum oxide. In a reaction, 2.91 g of Al reacted with oxygen to
form 5.50 g aluminum oxide. Calculate the empirical formula of aluminum oxide?
3. What is the minimum amount of LiCl, in grams, necessary to react with 106 g of Pb(C2H3O2)2?
4. In the combustion of octane (C8H18), octane reacts with oxygen. What is the mass of CO2 (in g) that is produced from
the complete combustion of 60.3 g of C8H18?
1) The required mass of iron III oxide is 2.1 Kg
2) The empirical formula of aluminum oxide is [tex]Al_{2} O[/tex].
3) The mass of lithium chloride required is 27.7 g
4) The mass of carbon dioxide produced is 186.6 g
What is the stoichiometry?We have to note that we can only be able to obtain the parameters that has to do with an equation when we can be able to use the stoichiometry of the reaction and this depends on the equation of the reaction.
1) Number of moles of iron = 1.50 * 10^3 g/ 56 g/mol
= 26.8 moles
If 2 mole of iron III oxide produces 4 moles of iron
x moles of iron III oxide produces 26.8 moles of iron
x = 13.4 moles
Mass of the iron III oxide = 13.4 moles * 160 g/mol
= 2.1 Kg
2) Number of moles of Al = 2.91 g/27 g/mol
= 0.11 moles
Number of moles of oxygen = ( 5.50 - 2.91 )/32 g/mol
= 0.06 moles
Dividing through by the lowest ratio, the empirical formula is [tex]Al_{2} O[/tex].
3) Number of moles of lead II acetate = 106 g/325 g/mol
= 0.33 moles
If 1 mole of lead II acetate reacts with 2 moles of lithium chloride
0.33 moles would react with 0.33 * 2/1
= 0.66 moles of lithium chloride
Mass of the the lithium chloride = 0.66 moles * 42 g/mol
= 27.7 g
4) Number of moles of octane = 60.3 g/114 g/mol
= 0.53 moles
2 moles of octane produces 16 moles of carbon dioxide
0.53 moles of octane produces 0.53 * 16/2
= 4.24 moles
Mass of carbon dioxide = 4.24 moles * 44 g/mol
= 186.6 g/mol
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given the balanced equation: 2 n2h4(l) n2o4(l) 3 n2(g) 4 h2o(g) a) how many grams of dinitrogen tetrahydride are required to produce 57 moles of nitrogen?
Dinitrogen tetrahydride must be converted into 38 moles [tex]N_2H_4[/tex] in order to yield 57 moles of nitrogen.
[tex]x molN_2H_4= 57mol N_2(\frac{2 molN_2O_4}{3 molN_2} )\\x molN_2H_4= 19*2 molN_2H_4\\x mol N_2H_4= 38 mol N_2H_4[/tex]
Dinitrogen tetroxide is the chemical molecule N2O4, also known as nitrogen tetroxide (NTO) and occasionally amyl (typically among ex-USSR/Russian rocket engineers). It is a helpful reagent in the synthesis of chemicals. It and nitrogen dioxide combine to form an equilibrium combination. It has a 92.011 g/mol molar mass.
Dinitrogen tetroxide is a potent oxidizer that spontaneously reacts when it comes into touch with different types of hydrazine, making the two a popular bipropellant for rockets.
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How moles are present in 0.05g of sodium hydroxide the relative formula mass of sodium hydroxide is 40
The number of moles of sodium hydroxide in 0.05 grams can be calculated using the formula:
Number of moles = mass / molecular weight
The molecular weight of sodium hydroxide is 40 grams per mole, so the number of moles in 0.05 grams of sodium hydroxide is:
Number of moles = 0.05 grams / 40 grams/mol = 0.00125 moles
Thus, there are 0.00125 moles of sodium hydroxide in 0.05 grams of the substance. This is a very small amount, as one mole of any substance contains 6.022 x 10^23 atoms or molecules.
A newly discovered gas, gas Q, travels 3.40 times faster than carbon dioxide. What is the molar mass of gas Q?
Answer:6.241
Explanation :Step 1: List the known quantities and plan the problem.
Step 2: Solve. n=PVRT=0.987atm×0.677L0.08206L⋅atm/K⋅mol×296K=0.0275mol. Now divide g by mol to get the molar mass. ...
Step 3: Think about your result. The R value that corresponds to a pressure in atm was chosen for this problem.
which diol is produced by treatment of trans-2-butene with osmium tetroxide followed by workup with aqueous sodium bisulfite?
The (2R,3R)-(-)-2,3-Butanediol is the diol is produced by treatment of trans-2-butene with osmium tetroxide followed by workup with aqueous sodium bisulfite.
It is used as a chiral auxiliary, chiral ligand and constructing block. Cyclocondenses with ketones for (13)C NMR willpower of optical purity. It is used withinside the decision of carbonyl compounds in fueloline chromatography. Fully miscible in water (2R,3R)-2,3-butanediol.
Alkene oxidation with OsO4 accompanied through sodium bisulfite paintings up consequences withinside the syn addition of hydroxyl corporations. For trans-2-butene, the 2 hydroxyl corporations may want to similarly upload at the pinnacle face or backside face.
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2. a) use the ph scale to describe an acidic solution and a basic solution. 2. b) at what ph would a solution be considered neutral? why?
a. The pH scale on a solution that describes acidity is less than 7, and alkaline is more than 7.
b. The solution is considered neutral when the pH is 7
pH a is the degree of acidity or alkalinity of a solution from the value of the concentration of hydrogen and hydroxyl ions in it.
A solution is said to have an acidic pH if it has a pH of less than 7. The lower the pH of a solution, the more acidic the solution is. While a solution is said to be alkaline if it has a pH of more than 7. The higher the pH value of the solution, the more alkaline the solution is.
A solution is said to have a neutral pH if the value is 7. A pH value of 7 is said to be neutral because in pure water dissolved H+ ions and dissolved OH- ions are in the same amount.
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describe the different characteristics between metals, nonmetals, and metalloids on the periodic table.
what would happen if you used equal masses of all the compounds? for example, 2.00 g as opposed to equal moles of each compound?
a. equal masses would produce different amounts of CO2
b. equal masses would produce the same amount of CO2
c. equal masses would show extreme variation and be difficult to measure in the lab
option c - equal masses would show extreme variation and be difficult to measure in the lab if you used equal masses of all the compounds.
Equal masses would imply a different number of moles. And reactions are molecular in nature. A reaction between 1 mole of A and 1 mole of B, for example, produces 1 mole of C. However, because their molar masses are likely to differ, we cannot apply the same mass formula and expect the same result. Consider the reaction HCl + NaOH, which produces NaCl + H2O. This reaction demonstrates that 1 mole of hydrochloric acid and 1 mole of NaOH produces 1 mole of NaCl and 1 mole of water. However, the reaction is very different in terms of mass because each of the reactants has a different molar mass.
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a certain liquid x has a normal freezing point of -9.30 and a freezing point depression constant . calculate the freezing point of a solution made of of iron(iii) chloride
The supplied statement states that the supplied solution's freezing point is -12.1 °C.
What in chemistry is a solution?In chemistry, a solution is a homogeneous combination of two or more compounds in their relative proportions, which may be constantly changed up to what is known as the limit to solubility. Although solutions of vapors and particles are possible, the term "solution" is most frequently used to refer to the liquid condition of matter.
Briefing:FeCl₃ is dissolved, and X (the solvent) is a liquid.
Freezing point of X [tex]\left(T_f^0\right)[/tex] = -4.50°C
Depression constant ([tex]K_{f}[/tex]) = 1.82°C kg/mol
Weight of FeCl₃ = 0.11 kg = 0.11 * 10³g
Weight of X = 650 g = 650 * 10⁻³ kg
Freezing point of solution ([tex]T_{f}[/tex]) = ? ( In °C )
Therefore, we first determine the molality, and then we determine the freezing point of the solution using the depression in freezing idea.
As FeCl₃ dissociates in liquid.
Fe³⁺ + 3Cl⁻ → i.e. total 4 ions
So, vary Hoff factor for FeCl₃ = 4
We know,
Molar mass of FeCl₃ = 162.2g/mol
Calculation:
Molarity of solution (m) = moles of solute/amount of solvent
= Mass of FeCl₃/Molar mass of FeCl₃ * 1/ Mass of X
= 0.11 * 10³/162.2 * 1/ 650 * 10⁻³
= 1.0433 moles/kg
Now from depression for freezing point concept,
We have,
Δ[tex]T_{f}[/tex] = i * [tex]K_{f}[/tex] * m
[tex]T_f^0[/tex] - [tex]T_{f}[/tex] = i * [tex]K_{f}[/tex] * m
[tex]T_{f}[/tex] = [tex]T_f^0[/tex] - i * [tex]K_{f}[/tex] * m
= -4.50 - 4 * 1.82°C * 1.0433
[tex]T_{f}[/tex] = -12.1°C ( Freezing point of solution ).
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