Molar Ratio Practice Problems - Ed W. Clark High School
Molar Ratio Practice Problems
Following each equation are two requests for molar ratios from the equation.
1) N2 + 3 H2 → 2 NH3
N2 to H2: NH3 to H2:
2) 2 SO2 + O2 → 2 SO3
O2 to SO3: O2 to SO2:
3) PCl3 + Cl2 → PCl5
PCl3 to Cl2: PCl3 to PCl5:
4) 4 NH3 + 3 O2 → 2 N2 + 6 H2O
NH3 to N2: H2O to O2:
5) Fe2O3 + 3 CO → 2 Fe + 3 CO2
CO to CO2: Fe to CO:
Mole to Mole Practice Problems
Here's the equation to use for all three problems:
2 H2 + O2 → 2 H2O
1) How many moles of H2O are produced when 5 moles of oxygen are used?
Remember: Starting with five moles of oxygen and based on the balanced equation, for every 1 mole of oxygen used, two moles of water are produced.
_______ moles O2 x 2 mole H2O =
1 mole O2
2) If 3.00 moles of H2O are produced, how many moles of oxygen must be consumed?
3) If 2.5 moles of H2O are produced, how many moles of hydrogen gas must be used,?
4) Suppose 4.00 grams of H2 were used? How many grams of water would be produced?
Molar Ratio Practice Problems Solutions
Following each equation are two requests for molar ratios from the equation.
1) N2 + 3 H2 → 2 NH3
N2 to H2: NH3 to H2:
2) 2 SO2 + O2 → 2 SO3
O2 to SO3: O2 to SO2:
3) PCl3 + Cl2 → PCl5
PCl3 to Cl2: PCl3 to PCl5:
4) 4 NH3 + 3 O2 → 2 N2 + 6 H2O
NH3 to N2: H2O to O2:
5) Fe2O3 + 3 CO → 2 Fe + 3 CO2
CO to CO2: Fe to CO:
Mole to Mole Practice Problems
Here's the equation to use for all three problems:
2 H2 + O2 → 2 H2O
1) How many moles of H2O are produced when 5 moles of oxygen are used?
Remember: Starting with five moles of oxygen and based on the balanced equation, for every 1 mole of oxygen used, two moles of water are produced.
_______ mol O2 x 2 mol H2O =
1 mol O2
2) If 3 moles of H2O are produced, how many moles of oxygen must be consumed?
Answer: 1.5 mol O2
3) If 2.5 moles of H2O are produced, how many moles of hydrogen gas must be used?
Answer: 2.5 mol H2
4) Suppose 4.0 grams of H2 were used? How many grams of water would be produced?
Answer: 36.0 grams H2O
-----------------------
moles H2O water
1:3
2:3
1:2
1:2
1:1
1:1
3:1
2:1
2:3
1:1
5
10
mol H2O water
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