Gas Stoichiometry Problems

Consider the reaction.
N2(g) + 3H2(g) → 2NH3(g)
How many grams of N2 are required to produce 100.0 L of NH3 at STP?

62.54 g

Under which conditions does the molar volume of a gas is consider standard?

at 273 K and at 1.0 atm

Decomposition of potassium chlorate (KClO3) produces potassium chloride (KCl) and pure oxygen (O2). The balanced equation for the reaction is as follows.
2KCIO3(s) → 2KCI(s) + 3O2(g)
What volume of oxygen gas is released at STP if 10.0 g of potassium chlorate is decomposed? (The molar mass of KClO3 is 122.55 g/mol.)

2.74 L O2

Consider the balanced chemical equation for the combustion of methane (CH4).
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
Given that the molar mass of CO2 is 44.01 g/mol, how many liters of oxygen is required at STP to produce 88.0 g of CO2 from this reaction?

89.6 L O2

Consider the reaction.
CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)
How many grams of methane should be burned in an excess of oxygen at STP to obtain 5.6 L of carbon dioxide?

4.0 g CH4

According to the equation 2Na + 2H2O mc012-1.jpg 2NaOH+H2, what mass of Na is required to yield 22.4 L of H2 at STP? (The atomic mass of Na is 22.99 u.)

46.0 g Na

Nitrogen reacts with hydrogen to produce ammonia gas as follows.
N2(g) + 3H2(g) → 2NH3(g)
How many moles of nitrogen would react with excess hydrogen to produce 520 mL of ammonia?

0.012 mol N2

What is the molar volume of a gas at standard temperature and pressure?

22.4 L

Propane (C3H8), a fuel that is used in camp stoves, produces carbon dioxide (CO2) and water vapor (H2O) on combustion as follows.
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
Given that the molar mass of H2O is 18.02 g/mol, how many liters of propane are required at STP to produce 75 g of H2O from this reaction?

23 L C3H8

What is the volume of 2 mol of chlorine gas at STP?

44.8 L

What volume would 3.01•10^23 molecules of oxygen gas occupy at STP?

11.2 L O2

Magnesium reacts with hydrochloric acid (HCl) as follows.
Mg(s) + 2HCI(aq) → MgCl2(aq) + H2(g)
How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP?

450 mL H2