Question

How is stoichiometry used to calculate amounts of substances in a chemical reaction?

A) By calculating the number of moles involved in the reaction
B) By using the balanced equation to determine the mole ratio
C) By measuring the mass of the reactants and products
D) By calculating the percent yield of a reaction

Answer 1

Stoichiometry uses mole calculations and mass measurements, based on balanced chemical equations, to determine the quantities of reactants and products in a chemical reaction, including the calculation of percent yield.

Step-by-step explanation:

Stoichiometry is used to calculate amounts of substances in a chemical reaction by calculating the number of moles involved in the reaction, using the balanced equation to determine the mole ratio, and by measuring the mass of the reactants and products. This is accomplished through a series of steps:

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The percent yield of a reaction can also be calculated by comparing the actual yield (mass of product obtained) to the theoretical yield (mass of product predicted by stoichiometry), and then multiplying by 100 to get a percentage.