Reaction Stoichiometry Exam Review

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What is Reaction Stoichiometry?

Back

Reaction Stoichiometry is the calculation of the quantities of reactants and products in a chemical reaction based on the balanced chemical equation.

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What is a limiting reactant?

Back

A limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product that can be formed.

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What is an excess reactant?

Back

An excess reactant is a substance that is not completely consumed in a chemical reaction and remains after the reaction has occurred.

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How do you identify the limiting reactant?

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To identify the limiting reactant, compare the mole ratio of the reactants used in the reaction to the mole ratio in the balanced equation.

Front

What is the balanced equation for the combustion of methane (CH4)?

Back

The balanced equation is: CH4 + 2O2 → CO2 + 2H2O.

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How many grams of CO2 are produced from 20.0 g of CH4?

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18.3 g of CO2 are produced when 20.0 g of CH4 reacts with sufficient O2.

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What is the mole ratio of Al to O2 in the reaction 4 Al + 3 O2 → 2 Al2O3?

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The mole ratio of Al to O2 is 4:3.

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If 45 grams of O2 are used, how much Al is needed?

Back

1.875 moles of Al are needed to completely react with 45 grams of O2.

Front

What is the product of the reaction between hydrogen and oxygen?

Back

The product of the reaction is water (H2O).

Front

How many water molecules are produced from 2 H2 + O2?

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2 H2 + O2 produces 2 H2O molecules.