Mass-to-Mass Stoichiometry Worksheet

Question 1

Which sequence converts the mass of a reactant to the predicted mass of a product?

1. Mass reactant → moles reactant → moles product → mass product
2. Mass reactant → mass product → moles product → moles reactant
3. Mass reactant → moles product → mass product → moles reactant
4. Mass reactant → formula mass product → mass reactant → moles product

Question 2

For 2H₂ + O₂ → 2H₂O, calculate the mass of water formed from 4.04 g H₂ with excess O₂. Show the mole ratio.

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Question 3

For N₂ + 3H₂ → 2NH₃, which conversion factor takes moles of N₂ to moles of NH₃?

1. 1 mol NH₃/2 mol N₂
2. 3 mol NH₃/1 mol N₂
3. 2 mol NH₃/1 mol N₂
4. 2 mol N₂/1 mol NH₃

Question 4

For N₂ + 3H₂ → 2NH₃, a student multiplies 10.0 g of N₂ by 2 to predict the mass of NH₃. Explain the mistake.

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Question 5

Which mass should be converted to moles to calculate CaO yield from this sample?

1. 25.0 g of CaCO₃
2. 50.0 g of CaCO₃
3. 25.0 g of CaO
4. 50.0 g of CO₂

Question 6

Calculate the predicted mass of CaO. Show how the mass of CaCO₃ and the equation are used.

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Question 7

Which mass of CO₂ is produced in the model?

1. 5.50 g
2. 11.0 g
3. 14.0 g
4. 25.0 g

Question 8

The solid residue has less mass than the original rock. Explain how the model accounts for the difference.

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