Answer:
72264x10²³moles
Explanation:
By Avogadro constant one mole of a substance is equal to 6022x10²³. so 12 hydrogen atoms =
12×6022x10²³=72264x10²³ moles.
how the various concentrations of acid will affect the amount of limestone that is dissolved from each jar.
The explanation of the how the various concentrations of acid will affect the amount of limestone has been given below.
Effects of acid rain on limestone:-
When an acid combines with a carbonate, it produces carbon dioxide as a gas and forms a salt that is soluble in the carbonate and acid's water.There are several gases in the atmosphere that can dissolve in precipitation such as rain and snow.Some may produce acids in rain water, such as carbonic acid, sulfuric acid, and nitric acid.Because the concentration is modest, the rain is not highly acidic, but it is acidic enough to react with the carbonates that make up limestone.Thus we discussed the affects of acid rain on limestones above.
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Which of the following is not a type of structural isomerism? A. Functional group B. Optical C. Chain D. Positional
Answer:
B. Optical
Explanation:
First, let's go through what isomerism is. Isomerism is the relation of two or more compounds, radicals, or ions that are composed of the same kinds and numbers of atoms but differ from each other in structural arrangement (structural isomerism), as CH3OCH3 and CH3CH2OH, or in the arrangement of their atoms in space and therefore in one or more properties. There are 5 types of structural isomerism. They are chain isomerism, position isomerism, functional group isomerism, metamerism, and tautomerism. This would mean that these types of structural isomerism that are in the options would be eliminated as the question ask which of the "following" is not a type of structural isomerism. This would leave the only option available which is Option B. Optical Isomerism. So instead of being a structural isomerism, it is a type of stereoisomerism. Stereoisomerism is the arrangement of atoms in molecules whose connectivity remains the same but their arrangement in space is different in each isomer.
Therefore, the answer is Option B. Optical.
A certain hydrocarbon has a chemical composition of 79.85% of carbon and 20.15% of hydrogen. The molar mass is 60.16 g/mol. What is the molecular formula for this compound
The molecular formula for the compound is [tex]C_{4} H_{8}[/tex] .
Given:% of C = 79.85%
% of H = 20.15%
Let the mass of the compound be 100g, then
Mass of C = 70.85 g
Mass of H = 20.15 g
Molar mass = 60.15 g/mol
Moles of Carbon = [tex]\frac{79.85}{12.01 g/mol}[/tex]
= [tex]6.64 mol[/tex]
Moles of Hydrogen = [tex]\frac{20.15}{1.00794 g/mol}[/tex]
= [tex]19.99 mol[/tex]
And we divide both sides by the lower quantity;
[tex]C_{\frac{6.64 mol}{6.64 mol} } H_{\frac{19.99 mol}{6.64 mol} }[/tex] ≅ CH₂
And [tex](empirical formula)_{n} = molecular formula[/tex]
60.15 g/mol = n × ( 12.01 + 2 × 1.00794)
n = 4
Therefore, the molecular formula for the compound is [tex]C_{4} H_{8}[/tex] .
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The process by which liquid metals turns into tiny solid particles at the phase boundary temperature is called:
What is Solidification?
The process by which liquid metals turn into tiny solid particles at the phase boundary temperature is known as solidification or freezing.
How does solidification occur?
Solidification occurs when a liquid's temperature is reduced below its freezing point. Although the freezing point and melting point of the majority of materials are the same temperatures, this is not always the case and the words freezing point and melting point are not synonymous.
When a liquid turns into a solid, the process is always exothermic, which means heat is released.
Based on casting technology, solidification is a key component of several other processes, such as crystal growth, welding, surface alloying, the manufacturing of ingots, and the purification and refinement of raw materials. It is a crucial step in the technology of metals, as well as ceramics and polymers.
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4NH3(g) + 5O2(g) 4NO(g) + 6H2O(g)
In a reaction that produced 34.8 L of water vapor, what volumes of ammonia and oxygen were consumed?
1. The volume of ammonia consumed in the reaction is 23.2 L
2. The volume of oxygen consumed in the reaction is 29 L
Balanced equation4NH₃(g) + 5O₂(g) --> 4NO(g) + 6H₂O(g)
From the balanced equation above,
6 L of H₂O were produced from 4 L of NH₃ and 5 L of O₂
1. How to determine the volume of ammonia, NH₃ consumedFrom the balanced equation above,
6 L of H₂O were produced from 4 L of NH₃
Therefore,
34.8 L of H₂O will be produced from = (34.8 × 4) / 6 = 23.2 L of NH₃
Thus, 23.2 L of NH₃ were consumed
2. How to determine the volume of oxygen, O₂ consumedFrom the balanced equation above,
6 L of H₂O were produced from 5 L of O₂
Therefore,
34.8 L of H₂O will be produced from = (34.8 × 5) / 6 = 29 L of O₂
Thus, 29 L of O₂ were consumed
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A slow reaction speeds up when a chemical is added.
When the reaction is complete, it is found that the
added chemical has not changed in any way. Using
the collision theory, explain this phenomenom.
The collision theory explains this outcome since when the reaction is complete reactant particles can not interact and therefore the reaction does not occur.
What is the collision theory?The collision theory is a well sustained theory used in chemistry that states reactions are caused by the collision of particles that form their molecules.
This theory (collision theory) may result very useful to explain the rate of change in a given chemical reaction.
In conclusion, the collision theory explains this outcome since when the reaction is complete reactant particles can not interact and therefore the reaction does not occur.
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How much heat is needed to vaporize 10.00 grams of water at 100.0°c? the latent heat of vaporization of water is 2,259 j/g. 22.59 j 1,000 j 2,269 j 22,590 j
The correct option is:
The latent heat of vaporization of water is given by option D. 22,590J
Latent heat of vaporization:
Latent heat of vaporization is energy required to change 1 kg of liquid to gas at atmospheric pressure at its boiling point.
Also, Latent heat is the energy released or absorbed during a phase change.
Energy released during phase change is Exothermic process.
Whereas energy absorbed during phase change is Endothermic process.
Q=mL
Q= Latent heat
m= mass= 10 g
L= Latent heat of vaporization= 2,259 J/g
Putting the values in the above equation:
Q=10*2259
Q=22590 L
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Which sentences describe the logistic growth model?
There are three different phases of the S-shaped curve. At first, growth is exponential because individuals are few and resources are plenty. This growth model occurs in a situation where resources are plenty and individuals are few to consume the resources. Population growth decreases as resources become limited. When a population size reaches the carrying capacity of its environment, the population growth slows down or stops completely. The model looks like a J-curve.
The sentences describe the logistic growth model is when a population size reaches the carrying capacity of its environment, the population growth slows down or stops completely.
What is logistical growth?Logistic or sigmoidal growth involves exponential population growth followed by a steady reduction in population growth until the population size stabilizes, assuming an S-shaped curve.
In this case, we can say this affirmation is true for the S-curve, but not the J-curve.
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What is the pH and pOH of a 1.2 x 10 M HBr solution?
-log(1.2x10^-3) = 2.92 = pH
14 - 2.92 = 11.08 = pOH
socratic
studycom
What is the [H+] if the pH of a
solution is 11.3?
[H+] = [? ] × 10^[?]]
Answer:
5.01 x 10^-12
Explanation:
Formula [H+]=10^-ph 》》 10^-11.2
-Hope this helps!!
What is one disadvantage of using fossil fuels?
Answer:
Fossil fuels contribute to greenhouse gases, which is one of their major disadvantages. The most harmful for the environment is coal because it has many more harmful combustion products than other fossil fuels.
Which statement is true if the AHrxn of a reaction is positive?
∆H of a reaction is positive
Means the reaction is emitting energy in terms of product Hence the reaction is exothermicThe energy is given to the surroundingsWhat is the IUPAC name for this compound?
Answer:
valeric acid
Explanation:
I don't know exactly. But try this one.
Answer:
IUPAC NAME: PENTANOIC ACID
COMMON NAME: VALERIC ACID
1.Tritium, of hydrogen-3, is prepared by bombarding lithium-6 with neutrons. A 0.250-mg sample of tritium decays at the rate of 8.94 x 1010 disintegrations per second. What is the decay constant (in per sec) of tritium, whose atomic mass is 3.02 amu
The decay constant (in per sec) is 1.79* 10^ -9/sec
The rate of decay is 8.94 x 1010 nuclei/s. The number of nuclei in the sample is
The rate equation is rate = kNt. Solve for k.
An exponential function has a variable exponent, a positive base, and a base that is not equal to one.
For instance, F (x) = 4x is an exponential function since the exponent is set rather than variable.
Instead of being an exponential function, f (x) = x3 is a fundamental polynomial function.
The graphs of exponential functions are continuously curved and never reach a horizontal asymptote.
Several real-world phenomena are governed by exponential or logarithmic functions.
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Determine the empirical formula of a compound containing 47.37 grams of carbon, 10.59 grams of hydrogen, and 42.04 grams of oxygen. In an experiment, the molar mass of the compound was determined to be 228.276 g/mol. What is the molecular formula of the compound
The molecular formula is C9H24O6
Given the Mass of C = 47.37g ,Mass of H = 10.59g and Mass of O = 42.04g
The total mass of these elements is 100g, taking a proportion of their molar masses.
C = 47.37/12= 3.95
H = 10.59/1 = 10.59
O = 42.04/16= 2.63.
Dividing with the smallest proportion which is 2.63
C=3.95/2.63 = 1.5
H =10.59/2.63 =4
O = 2.63/2.63= 1
Multiplying by 2 to get a whole number.
C = 1.5x2 = 3
H= 4x2 = 8
O = 1x2= 2
The empirical formula is C3H6O2
(Empirical formula)n= molecular mass
(C3H8O2)n =228.276
(12x3 +8+16x2)n= 228.276
76n = 228.276
n = 228.276/76
n = 3
Molecular formula = (Empirical formula)n
= (C3H8O2)3 = C9H24O6
The molecular formula is C9H24O6
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An electron can be added to halogen atom to force a halide ion with
An electron can be added to halogen atom to force a halide ion with 8 valence electrons
What is an atom?An atom can be defined as the smallest part of an element which can take part in a chemical reaction.
However whenever, an electron is added to halogen atom to force a halide ion with 8 different valence electrons
So therefore; an electron can be added to halogen atom to force a halide ion with 8 valence electrons
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Which of the following is a chemical change?
A) Mixing chalk powder with sand
B) Melting of ice
C) Dissolving sugar in water
D) Cooking an egg
Answer:
cooking an egg
Explanation:
Hope it works
Which chemical formula corresponds to this structural formula? h6c6h6h2 c14h6 c6h6 c2h6o
C₂H₆O is referred to the chemical formula corresponds to this structural formula and is denoted as option D.
What is Chemical formula?This contains information about the chemical proportion of atoms present in a molecule.
In this scenario, there are two carbon atoms, six hydrogen atoms and one oxygen atom which can be written as C₂H₆O. This is therefore the most appropriate choice in this scenario.
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Answer: D.) C6H14
Explanation: i hope this helps (this is for another question you might have tho) :)
Explain how the experimental molecular mass would have been affected (too high, too low or unchanged) if the mass of the flask had been measured with condensed vapor and residual water on the outside. Please support your answer.
If the flask already has water, your measure is going to be higher than expected and MW is going to be higher too.
At first sight, we need to assume 1 atm as atmospheric pressure, probably forgot to write down this value in the Lab. By doing this, we got all values to calculate the MW.
So, for trial 1:
MW = [0.36 g x (0.082 atm x L / K x mol) x 301 K] / (1 atm x 0.125 L) = 71.08 g/mol
Trial 2:
MW = [0.38 g x (0.082 atm x L / K x mol) x 301 K] / (1 atm x 0.125 L) = 75.53 g/mol
Average MW = 73.31 g/mol
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what is a chemical germicides that has been formulated for use on the skin and is registered and regulated by the food and drug administration? milady barbering
Antiseptics is a chemical germicides that has been formulated for use on the skin and is registered and regulated by the food and drug administration.
Chemical germicidesA chemical or chemical combination used to eradicate microorganisms. Any procedure that removes and/or kills microorganisms is referred to as decontamination. The same phrase is also used to remove or neutralize radioactive materials, toxic compounds.A germicide is a substance that may eliminate microorganisms, particularly harmful ones (sometimes known as "germs"). Antiseptics and disinfectants are both considered germicides. Disinfectants are antimicrobials solely administered to inanimate items, whereas antiseptics are germicides applied to live tissue and skin.Learn more about organism here:
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If an electron in an atom gains energy to go from a lower energy level to a higher energy level, it ______________
If an electron in an atom gains energy to go from a lower energy level to a higher energy level, it is called Excited energy state.
Ground state energy: The lowest energy state for an electron is called its ground state, which is the energy level it typically resides in. Each electron has a limit on how much energy it can have while still remaining a part of its atom. It is the most stable state of electron.
Excited state energy: An electron is in an excited state when it momentarily possesses an energy state higher than its ground state. If an electron receives additional energy, such as when it absorbs a photon, or packet, of light, or collides with an adjacent atom or particle, it can become excited. As these excited state energy level are unstable. So while coming back to ground state electrons emit radiations suitable wavelength.
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HELP!!!! Will mark give 5 stars and thank!! Please!
Many types of chemical reactions include a thermochemical component
In a paragraph, compare and contrast endothermic and exothermic
reactions, including a real-world example of each type.
Answer:
An endothermic reaction is a reaction where heat is taken in from the surroundings. This could be in the process of vaporisation from liquid to gas. However an exothermic reaction is when heat is given out to the surroundings. An example of this would be condensation gas to liquid!
Explanation:
A balloon contains 10.0 g of helium gas. If the initial volume is V, and the temperature
and pressure are held constant, what is the final volume (in terms of V) after 10.0 g
of neon is added?
Answer:
1.2 V
Explanation:
10 g helium = 2.5 moles He
10 g Neon = ~ .5 mole neon
2.5 is to V as (2.5 + .5) is to x
2.5 / V = 3/x
2.5 x = 3 V
x = 3/2.5 V = 1 1/5 V
Avogadro's Law (P,T constant)
[tex]\tt \dfrac{V_1}{n_1}=\dfrac{V_2}{n_2}[/tex]
n = mol
V = volume
AM He = 4 u, mol = 10 : 4 = 2.5
AM Ne = 20 u, mol = 10 : 20 = 0.5
[tex]\tt \dfrac{V}{2.5}=\dfrac{V_2}{2.5+0.5}\\\\V_2=\boxed{\bold{1.2V}}[/tex]
A 0.674m cobalt (ii) chloride (cocl2) solution is prepared with a total volume of 0.0750l. the molecular weight of cocl2 is 128.9 g/mol. what mass of cocl2 in grams is needed for this solution?
The mass of CoCl₂ is 6.515 g.
Calculation:
Given,
Molarity of the solute (CoCl₂) = 0.674 M
Volume of solution = 0.0750 L
Molecular weight of solute (CoCl₂) = 128.9 g/mol
Molarity formula is used to solve this question.
Molarity is defined as the number of moles of solute per liter of solution.
[tex]Molarity = \frac{number of moles }{volume (in L)}[/tex] .......(i)
We know that,
[tex]number of moles = \frac{weight of given solute }{molecular mass if the solute}[/tex] ........(ii)
Put the above values in equation (i)
[tex]0.674 = \frac{number of moles}{0.0750}[/tex]
[tex]number of moles = 0.674 (0.0750)[/tex]
[tex]number of moles = 0.05055[/tex]
Put the number of moles in equation (ii)
[tex]0.05055 = \frac{weight of given solute}{128.9}[/tex]
[tex]weight of given solute = 0.05055 (128.9)[/tex]
[tex]weight of given solute = 6.515 g[/tex]
Therefore, 6.515 g of CoCl₂ is needed.
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What is 1 atmospheric pressure?
Answer:
101325 pascal
Explanation:
i dont cap
Answer:
See below
Explanation:
1 atmosphere = 101 325 Pascals = 760 mm Hg = 14.6959 psi
A 2.65 g sample of a salmon colored poweder contains 0.70 g of chromium, 0.65 g of sulfur, and 1.30 g of oxygen. The molar mass is 392.2. What is the formula of the compound
The formula of the compound is [tex]$\mathrm{Cr}_{2} \mathrm{~S}_{3} \mathrm{O}_{12}$[/tex]
Given
Salmon colored powder = 2.65 g
Chromium = 0.70 g
Sulfur = 0.65 g
Oxygen = 1.30 g
Molar mass = 392.2
FormulaMolar mass = gram / moles
Molecular formulaA chemical equation that specifies how many atoms of each element there are in each substance's molecules.The simplest whole-number ratio of the various atoms in a compound is represented by an empirical formula. The precise number of various atom types present in a compound's molecule is indicated by the molecular formula.Molar mass of chromium
= 0.70 / 0.0135
= 52
Molar mass of salmon
= 0.65 / 0.0203
= 32.06
Molar mass of oxygen
= 1.30 / 0.0813
= 16
Molecular formula = 392.2 / (Cr + 3 S + 12 O)
= 392.2 / (52.00 + (3 x 32.06 + 12 x 16.00) ≈ 1
So, The formula of the compound is [tex]$\mathrm{Cr}_{2} \mathrm{~S}_{3} \mathrm{O}_{12}$[/tex]
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The. bond dissociation enthalpies of the H-H bond and the H-Cl bond are 435 kJ mol^-1 and 431 kJ mol^-1, respectively. The ΔHfO of HCL(g) is -92kJ mol^-1 . What is the bond dissociation enthalpy of the Cl-Cl bond?
The bond dissociation energy of the Cl - Cl bond is -958 kJ mol^-1.
What is the dissociation enthalpy?Given that;
H-H bond energy = 435 kJ mol^-1
H-Cl bond energy = 431 kJ mol^-1
ΔHfO of HCL(g) = -92kJ mol^-1
Bond dissociation enthalpy of the Cl-Cl bond = x
-92 = 435 + 431 + x
x = -92 - (435 + 431)
x = -958 kJ mol^-1
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Calculate the volume in milliliters of a M nickel(II) chloride solution that contains of nickel(II) chloride . Round your answer to significant digits.
190 milliliters is the volume of a 0.92M nickel(II) chloride solution that contains 175 mmol of nickel(II) chloride (NiCI₂).
What is Molarity ?Molarity (M) is defined as the number of moles of solute dissolved in 1L of solution. Molarity is also known as Molar Concentration. The S.I unit of Molarity is molar (M) or mol/L.
Molarity = [tex]\frac{\text{Number of moles}}{\text{Volume of solution (in L)}}[/tex]
Moles of nickel(II) chloride = 175 mmol
Molarity of the nickel(II) chloride = 0.92 M
Convert mmol into mol
1 milimol = 0.001 mol
175 mmol = 0.175 mol
Now put the value in above formula to find the volume of solution
Molarity = [tex]\frac{\text{Number of moles}}{\text{Volume of solution (in L)}}[/tex]
[tex]0.92\ M = \frac{0.175\ mol}{\text{Volume of solution}}[/tex]
Volume of solution = [tex]\frac{0.175\ mol}{0.92\ M}[/tex]
Volume of solution = 0.1902 L
Convert L into mL
1 L = 1000 mL
0.1902 L = 0.1902 × 1000 mL
= 190.2 mL
≈ 190 mL
Thus from the above conclusion we can say that 190 milliliters is the volume of a 0.92M nickel(II) chloride solution that contains 175 mmol of nickel(II) chloride (NiCI₂).
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: Calculate the volume in milliliters of a 0.92M nickel(II) chloride solution that contains 175 mmol of nickel(II) chloride (NiCI₂). Round your answer to significant digits.
You need 440 mL of a 30% alcohol solution. On hand, you have a 40% alcohol mixture. How much of the 40% alcohol mixture and pure water will you need to obtain the desired solution
110ml of the 40% alcohol mixture and pure water will need to obtain the desired solution
Given that 0.30 * 440 = 132 mL of pure alcohol needed
132 mL = 0.40 * x mL of 0.4
x = 330 mL of 70%
440 - 330 = 110 mL of H2O
Water content differs
If you have 440 mL of a 30% alcohol mixture, then (440mL)*(0.30) = 132mL of that solution is alcohol.
Similarly, if you have x mL of a 40% alcohol mixture, then (x mL)(0.40) = 0.40x mL of that solution is alcohol.
When you combine these two liquids, you will have (440 + x) mL of liquid and you want it to be 40% alcohol.
Hence 110ml of the 40% alcohol mixture and pure water will need to obtain the desired solution
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Please help I need an answer , URGENTLY !
Answer:
Aluminium metal reacts vigorously with all the halogens to form aluminium halides. So it reacts with chlorine, bromine, and iodine.