Gas Stoichiometry Practice Sheet
1)
For the reaction 2 H2(g) + O2(g)  2 H2O(g), how many liters of water can be
made from 5 L of oxygen gas and an excess of hydrogen?
2)
How many liters of water can be made from 55 grams of oxygen gas and
an excess of hydrogen at STP?
3)
How many liters of water can be made from 55 grams of oxygen gas and
an excess of hydrogen at a pressure of 12.4 atm and a temperature of 85 0
C?
4)
How many liters of water can be made from 34 grams of oxygen gas and
6.0 grams of hydrogen gas at STP? What is the limiting reactant for this
reaction?
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Gas Stoichiometry Practice Sheet Answers
1)
For the reaction 2 H2(g) + O2(g)  2 H2O(g), how many liters of water can be
made from 5 L of oxygen gas and an excess of hydrogen?
10 L
5L O2 x 2L H2O/1L O2 =
2)
How many liters of water can be made from 55 grams of oxygen gas and
an excess of hydrogen at STP?
77 L
55g O2 x 1 molO2/32g O2 x 22.4L O2/1mol O2 x 2l H2O/1L O2 =
3)
How many liters of water can be made from 55 grams of oxygen gas and
an excess of hydrogen at a pressure of 12.4 atm and a temperature of 85 0
C?
8.15 L
55g O2 x 1mol O2/32g O2 x 2 mol H2O/1mol O2 = 3.44 mol H2O
(12.4atm)V = (3.44 mol O2)(0.0821)(273 +85)
4)
V=
How many liters of water can be made from 34 grams of oxygen gas and
6.0 grams of hydrogen gas at STP? What is the limiting reactant for this
reaction?
47.6 L, O2 is the limiting reactant
34g O2 x 1 mol O2/32g O2 x 2mol H2O/1 mol O2 = 2.13 mol H2O
(O2 L.R.)
6.0g H2 x 1 mol H2/2.02g H2 x 2 mol H2O/2 mol H2 = 2.97 mol H20
2.13 mol H2O x 22.4 L H2O/1 mol H2O =
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