Name _______________________________________________ Period _____ Date _________
Gas Stoichiometry practice sheet
1) Conversion review questions:
Convert each to grams (g)
a) 575mg
b) 57 kg
c) 7.8 x 106 kg
Convert each to Liters (L)
a) 575 mL
b) 5000 cm3
c) 9.5 x 106 µL
Convert each to kPa
a) 175.0 psi
b) 5.000 atm
c) 988.9 torr
2) For each of the four decide when a gas is possibly less likely to be ideal
a) Temperature: high or low?
b) Pressure: high or low?
c) Polarity of the molecule: polar or nonpolar?
d) mass of the particles: higher mass or lower mass?
3) Avogadro stated that equal volumes of gases under the
same conditions of temperature and pressure have equal _____________________________________.
4) How many moles are there in 1000.0 L of nitrogen gas measured at STP?
5) Ammonium nitrate decomposes when heated to produce dinitrogen monoxide and water.
Write a balanced equation, then determine: If 12.2 g of ammonium nitrate reacts, what volume of
dinitrogen monoxide, measured at 98.5 kPa and 14°C, is produced?
6) A piece of aluminum with a mass of 4.25 g is used to generate hydrogen gas by the following method.
2Al(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2(g) The hydrogen is collected at a temperature of 15°C and a
pressure of 94.4 kPa. What volume of hydrogen is produced?
7) In the reaction N2(g) + 3H2(g) → 2NH3(g), what volume of ammonia is formed when 360 mL of H2 gas
reacts? Assume that both gases are at STP.
8) Carbon disulfide burns in air to produce carbon dioxide gas and sulfur dioxide gas.
CS2(l) + 3O2(g) → CO2(g) + 2SO2(g) Determine the mass of CS2 required to produce 15.7 L of SO2 gas at
25°C and 99.4 kPa. (Hint: Start by calculating the moles of SO2.)
9) Hydrogen sulfide reacts with sulfur dioxide to give H2O and Sulfur:
H2S + SO2  H2O + S (solid), unbalanced.
If 6.0 L of H2S gas at 750 torr produced 3.2 g of sulfur, calculate the temperature in C.
10) A 50.0-L air sample containing H2S at STP is treated with a catalyst to promote the reaction,
H2S (g) + O2 (g) H2O + S (solid).
If 3.2 g of solid S was collected, calculate the volume percentage of H2S in the original sample.
(sequence: find mol H2S, L H2S, % H2S)
11) Assuming that the pressure and temperature of the reactants are the same, what volume of oxygen gas
is required to completely burn 5.60L of acetylene gas (C2H2; combustion reaction)
12) Ideal Gas Law Problem: A 250.0-mL sample of a noble gas collected at 88.1 kPa and 7°C has a mass
of 0.378 g. What is the molar mass of the gas? Identify the sample.
13) L mol  g problem: What is the mass of 187 L of CO2 gas? The volume is measured at STP.
Key: 4) 44.6 mol, 5) 3.69L, 6) 5.99L 7) 240mL, 8) 24.0g, 9) 812 C, 10) 4.5%, 11) 2.24L, 12) 40.0 g/mol, Ar 13) 367g