Back to Chemistry 1405 Practice Problems

Balance the equations, then solve for the required substance using dimensional analysis.

1) Nitrogen and oxygen react to form dinitrogen monoxide.

2N₂ + O₂ 2N₂O

If 7.4 grams of nitrogen reacts, how many grams of dinitrogen monoxide is produced?

Limiting Reagent Theoretical Yield
$LaTeX: 7.4gN_2\times(\frac{1molN_2}{28.02gN_2})\times(\frac{2molN_2O}{2molN_2})\times(\frac{44.02gN_2O}{1molN_2O})=$ 12g N₂O

If 6.8 grams of oxygen reacts, how many grams of dinitrogen monoxide is produced?

$LaTeX: 6.8gO_2\times(\frac{1molO_2}{32.00gO_2})\times(\frac{2molN_2O}{1molO_2})\times(\frac{44.02gN_2O}{1molN_2O})=$ 19g N₂O

Based on the information above, which would be the limiting reagent? _____N₂_____

2) Potassium and chlorine combined to make potassium chloride.

2K + Cl₂ 2KCl

If 0.14 g potassium reacts, how many grams of KCl is produced?

Limiting Reagent Theoretical Yield
$LaTeX: 0.14gK\times(\frac{1molK}{39.10gK})\times(\frac{2molKCl}{2molK})\times(\frac{74.55gKCl}{1molKCl})=$ 0.27g KCl

If 0.23 g chlorine reacts, how many grams of KCl is produced?

$LaTeX: 0.23gCl_2\times(\frac{1molCl_2}{70.90gCl_2})\times(\frac{2molKCl}{1molCl_2})\times(\frac{74.55gKCl}{1molKCl})=$ 0.48g KCl

Based on the information above, which would be the limiting reagent? _____K_____

3) Aluminum reacts with oxygen to yield aluminum oxide.

4Al + 3O₂ 2Al₂O₃

If you have 14.5 g of aluminum, how many grams of aluminum oxide is produced?

$LaTeX: 14.5gAl\times(\frac{1molAl}{26.98gAl})\times(\frac{2molAl_2O_3}{4molAl})\times(\frac{101.96gAl_2O_3}{1molAl_2O_3})=$ 27.4g Al₂O₃

If you have 7.5 g of oxygen, how many grams of aluminum oxide is produced?

Limiting Reagent Theoretical Yield
$LaTeX: 7.5gO_2\times(\frac{1molO_2}{32.00gO_2})\times(\frac{2molAl_2O_3}{3molO_2})\times(\frac{101.96gAl_2O_3}{1molAl_2O_3})=$ 16g O₂

Based on the information above, which would be the limiting reagent? _____O₂_____

4) Copper II sulfide reacts with oxygen to produce copper II oxide and sulfur dioxide.

2CuS + 3O₂ 2CuO + 2SO₂

If you have 18.7 g of copper II sulfide, how many grams of copper II oxide is produced?

Limiting Reagent Theoretical Yield
$LaTeX: 18.7gCuS\times(\frac{1molCuS}{95.62gCuS})\times(\frac{2molCuO}{2molCuS})\times(\frac{79.55molCuO}{1molCuO})=$ 15.6g CuO

If you have 12.0 g of oxygen gas, how many grams of copper II oxide is produced?

$LaTeX: 12.0gO_2\times(\frac{1molO_2}{32.00gO_2})\times(\frac{2molCuO}{3molO_2})\times(\frac{79.55molCuO}{1molCuO})=$ 19.9g CuO

Based on the information above, which would be the limiting reagent? _____CuS_____

5) Nitrogen and hydrogen react to produce ammonia (NH₃).

N₂ + 3H₂ 2NH₃

If you have 2.6 g of nitrogen, how many grams of ammonia is produced?

Limiting Reagent Theoretical Yield
$LaTeX: 2.6gN_2\times(\frac{1molN_2}{28.02gN_2})\times(\frac{2molNH_3}{1molN_2})\times(\frac{17.04gNH_3}{1molNH_3})=$ 3.2g NH₃

If you have 1.7 g of hydrogen, how many grams of ammonia is produced?

$LaTeX: 1.7gH_2\times(\frac{1molH_2}{2.02gH_2})\times(\frac{2molNH_3}{3molH_2})\times(\frac{17.04gNH_3}{1molNH_3})=$ 9.6g NH₃

Based on the information above, which would be the limiting reagent? _____N₂_____

6) Hydrogen chloride is made by reacting sodium chloride with aqueous hydrogen sulfate.

2NaCl + H₂SO₄ Na₂SO₄ + 2HCl

If you have 30.0 g of sodium chloride, how many grams of hydrogen chloride are produced?

$LaTeX: 30.0gNaCl\times(\frac{1molNaCl}{58.44gNaCl})\times(\frac{2molHCl}{2molNaCl})\times(\frac{36.46gHCl}{1molHCl})=$ 18.7g HCl

If you have 2.59 g of hydrogen sulfate, how many grams of hydrogen chloride are produced?

Limiting Reagent Theoretical Yield
$LaTeX: 2.59gH_2SO_4\times(\frac{1molH_2SO_4}{98.08gH_2SO_4})\times(\frac{2molHCl}{1molH_2SO_4})\times(\frac{36.46gHCl}{1molHCl})=$ 1.93g HCl

Based on the information above, which would be the limiting reagent? _____H₂SO₄_____