Mole to Mass Conversion Problems (CHEM 1405)

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

1) How many moles of oxygen gas are required to produce 100.0 grams of water?

H₂ + O₂ H₂O

2) Calculate the number of moles of hydrochloric acid required to react with 2.57 grams of calcium hydroxide.

HCl + Ca(OH)₂ CaCl₂ + H₂O

b. How many grams of calcium hydroxide are needed to produce 4.45 moles of water?

3) How many moles of aluminum will be produced from 30.0 kg of aluminum oxide?

Al₂O₃ Al + O₂

b. If 52 g of aluminum are produced, how many moles of aluminum oxide are needed?

4) Calculate the number of moles of Na₂CO₃ required to make 100.0 g of NaNO₃.

Na₂CO₃ + HNO₃ NaNO₃ + CO₂ + H₂O

b. If 7.50 g of Na₂CO₃ reacts, how many moles of CO₂ are produced?

5) If 625 g of Fe₂O₃ are produced in the reaction, how many moles of hydrogen gas are produced at the same time?

Fe + H₂O H₂ + Fe₂O₃

b. How many moles of iron would be needed to generate 27 g of hydrogen gas?

c. If 52 moles of water are used, how many grams of iron (III) oxide would be produced?

6) If 0.905 moles of Al₂O₃ is produced in the following reaction, what mass of iron is also produced?

Fe₂O₃ + Al Fe + Al₂O₃

b. How many moles of Fe₂O₃ will react with 99.0 g of aluminum?

If 10.00 g of ammonia (NH₃) react, how many moles of ammonium hydrogen phosphate will be produced?

H₃PO₄ + NH₃ (NH₄)₂HPO₄

b. If 280 grams of product are produced, how many moles of phosphoric acid are required?

NH₄NO₃ N₂ + O₂ + H₂O

b. If 7.35 moles of water are produced, what was the mass of NH₄NO₃ that reacted?