Mass-Mass Stoichiometry

Multiple Choice

Balance this reaction: ____ RbNO₃ + ____ BeF₂ ----> ____ Be(NO₃)₂ + ____ RbF

• 1,1,1,1
• 1,2,1,1
• 2,1,1,2
• 2,1,2,1

Multiple Choice

N₂ + 3H₂ → 2NH₃

What is the mole ratio between N₂ and NH₃ in the above reaction?

• 1 moles NH₃ / 2 moles N₂

• 2 moles NH₃ / 1 moles N₂

• 2 moles N₂ / 3 moles NH₃

• 1 moles N₂ / 3 moles NH₃

Multiple Choice

Using the balanced chemical equation:

Mg + 2 HCl --> MgCl₂ + H₂

How many grams of MgCl₂ is produced if 4.67 moles of HCl react?

• 219 g MgCl₂

• 4.67 g MgCl₂

• 94 g MgCl₂

Mole to Mole Stoichiometry: 1 Train Track

Mole to Gram Stoichiometry: 2 Train Tracks

Gram to Mole Stoichiometry: 2 Train Tracks

Gram to Gram Stoichiometry: 3 Train Tracks

Stoichiometry Calculations

Multiple Choice

For the reaction $$2KClO_3 \rightarrow 2KCl + 3O_2$$ , if you start with 245 grams of $$KClO_3$$ (molar mass of KClO₃ = 122.55 g/mol), how many grams of $$O_2$$ (molar mass of O₂ = 32.00 g/mol) are produced?

• 48.0 grams

• 96.0 grams

• 128.0 grams

• 160.0 grams

Multiple Choice

For the reaction $$N_2 + 3H_2 \rightarrow 2NH_3$$ , if you start with 28 grams of $$N_2$$ (molar mass = 28.02 g/mol), how many grams of $$NH_3$$ (molar mass = 17.03 g/mol) can be produced?

• 17.03 grams

• 34.06 grams

• 51.09 grams

• 68.12 grams

Multiple Choice

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O
 What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

• 13.8 g O₂
• 3.86 mol of O₂
• 124 g O₂