Stoichiometry: Week in Review

What is the molar mass of table salt (NaCl)?

• 116.89 g/mol

• 35.45 g/mol

• 22.99 g/mol

• 58.44 g/mol

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What is the molar mass of NaOH?

• 40.00 g/mol

• 38.99 g/mol

• 23.99 g/mol

• 57.00 g/mol

In the equation 2 Al₂O₃ --> 4 Al + 3 O₂, what is the mole ratio of aluminum to oxygen (aluminum is asked for, oxygen is given)?

• 10/6

• 3/4

• 4/3

• 2/3

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In the reaction 2 H₂ + O₂ → 2 H₂O what is the mole ratio of oxygen to water

• 1/2

• 2/1

• 3/4

• 4/3

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2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

• 6.7 mol
• 1.0 mol
• 10.1 mol
• 4.5 mol

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KNO₃ --> KNO₂ + O₂
What coefficients are needed to balance the reaction?

• 2, 2, 1
• 2, 3, 2
• 1, 2, 2
• 1, 3, 1

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True or False. You must convert grams to moles to do stoichiometry.

• True
• False

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Mole ratios are obtained from the

• balanced chemical equation
• periodic table
• molar mass

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N₂ +  3H₂ → 2NH₃ 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

• 6
• 2
• 3
• 1

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2H₂   +   O₂  →  2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

• 4 moles
• 8 moles
• 16 moles
• 2 moles

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