Mole ratio review

What part of a balanced chemical equation gives information about the number of moles?

• the subscripts

• the chemical symbol

• the mass

• the coefficients

How many moles of iron are needed to react with oxygen to produce 2 moles of iron(III) oxide in this equation?

• 1

• 2

• 3

• 4

What is the mole ratio of oxygen to iron(III) oxide?

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How many moles of phosphine (PH₃) are produced when 1 mole of phosphorus reacts with 6 moles of hydrogen?

• 1

• 2

• 3

• 4

What is the mole ratio of phosphorus to hydrogen?

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3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe
What is the Ratio of moles of Mg to moles Fe?

• 3mol Mg / 2 mol Fe
• 2 mol Mg/ 3 mol Fe
• 1 mol Fe/ 2 mol Fe
• 3 mol MgO / 2 mol Fe

• 8 moles Al₂O₃

•  6 moles Al₂O₃

• 4 moles Al₂O₃

• 2 moles Al₂O₃