Gas Stoichiometry Worksheet Page 2
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38. Assume that 13.5 grams of solid aluminum react with HCl according to the
following balanced equation at STP:
2 Al (s) + 6 HCl (aq) à 2 AlCl
(aq) + 3 H
(g)
3
2
a. How many moles of Al react?
b. How many moles of H
are produced?
2
c. How many liters of H
are produced?
2
9. If air is 20.9% oxygen by volume,
a. How many liters of air are needed to complete the combustion of 25.0 L of
octane vapor (C
H
) at STP?
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b. What volume of each product is produced?
The following problems deal with reactions that do not occur at STP:
10. Ammonium sulfate, an important fertilizer, can be prepared by the reaction of
ammonia with sulfuric acid according to the following balanced equation:
à (NH
2 NH
(g) + H
SO
)
SO
(aq)
3
2
4
4
2
4
Calculate the volume of NH
(in liters) needed at 20ºC and 25.0 atm to react
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with 150 kg of H
SO
.
2
4
11. If 45.0 L of natural gas, which is essentially methane (CH
), undergoes
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complete combustion at 730 mm Hg and 20ºC, how many grams of each
product are formed?
12. Fritz Haber, a German chemist, discovered a way to synthesize ammonia gas
(NH
) by combining hydrogen and nitrogen gases at extremely high
3
temperatures and pressures.
a. Write the balanced equation for this reaction.
b. If 10 kg of nitrogen combines with excess hydrogen at 550ºC and 250
atm, what volume of ammonia gas is produced?
13. A 3.25 gram sample of solid calcium carbide (CaC
) reacts with water to
2
produce acetylene gas (C
H
) and aqueous calcium hydroxide. If the
2
2
acetylene was collected over water at 17ºC and 740.0 mm Hg, how many
milliliters of acetylene were produced?
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