write and balance the equation for the complete combustion of pentane, c5h12. what is the coefficient on oxygen gas, after it is balanced?

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.

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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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. 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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The percent error in the student's result is equal to 17.57 %.

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 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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The mass defect in Fe-56 is equal to 0.52823 amu.

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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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.

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.

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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A person floats much higher in the Dead Sea than in ordinary water because salt water has a higher density than fresh water. Saline water has a density of (1080 kg m per cube) while fresh water has a density of ( 1000 kg m per cube). Because of this, swimming in salt water is simpler for swimmers.

Compared to the 3.5% salinity of the Mediterranean, the Dead Sea has a salinity of 34.2%. It ranks behind the Don Juan Pond and Lake Vanda in Antarctica, the Lake Assal in Djibouti, and Lake Vanda as the fourth saltiest body of water in the world. The Dead Sea doesn't pour out, which is one of the causes of excessive salinity.

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Complete Question

The water of the Dead Sea is extremely salty. which gives it a very high density of 1240 kg/m^3. Explain why a person floats much higher in the Dead Sea than in ordinary water.

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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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

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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Hence one molecule of oxygen can be reduced  by one glucose molecule, if electrons are received from only glycolysis

The balanced chemical equation for the conversion of glucose to pyruvate shows that four hydrogen atoms (four protons and four electrons) are also formed:

CH 206 — 2 CH3-C-C-OH + 4H+ + 4e Glucose Pyruvate

Since there could be  4 lectrons and 4 hydrogens  from one molecule of that are from glucose to pyruvate step.

O2 + 4H+  + 4e-  = 2H2O

Hence one molecule of oxygen can be reduced .The method by which glucose is metabolised to create energy is known as glycolysis. It generates water, ATP, NADH, and two pyruvate molecules. It doesn't need oxygen to happen since it happens in a cell's cytoplasm. In both aerobic and anaerobic species, it happens.

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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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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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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.

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.

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 (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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0.321 g of hydrogen gas should be produced in this reaction.

To answer this question, we need to first calculate the number of moles of hydrogen gas produced when 0.159 moles of aluminum reacts with an excess of hydrochloric acid. Since the reaction is:

Al + HCl → AlCl3 + H2

The number of moles of hydrogen gas produced will be equal to the number of moles of aluminum used, i.e. 0.159 moles.

Next, we need to convert this number of moles of hydrogen gas to the number of grams of hydrogen gas. For this, we use the molar mass of hydrogen gas, which is 2.02 g/mol.

Therefore, the number of grams of hydrogen gas produced when 0.159 moles of aluminum reacts with an excess of hydrochloric acid is:

0.159 moles * 2.02 g/mol = 0.321 g.

Hence, the answer is 0.321 g of hydrogen gas.

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The wet bulb temperature if the dry bulb is 26 °C and the relative humidity is 77% is 16°C.

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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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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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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Silver spoon (Ag) is a conductor of electricity in the solid state.

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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 supplied statement states that the supplied solution's freezing point is -12.1 °C.

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.

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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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

In the electron configuration 2 8 18 6 for element 34, Selenium:

The statement that applies include:

Selenium is a chemical element with the symbol Se and atomic number 34 and  a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic.

The octet rule refers to the chemical rule of thumb which states that the tendency of atoms to prefer to have eight electrons in the valence shell.

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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.

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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The wavelength of an electromagnetic radiation that has a frequency of 5.65 x 10¹¹ hertz is 5.31 × 10-⁴m.

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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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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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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