Stoichiometry Review

Front

What is stoichiometry?

Back

Stoichiometry is the branch of chemistry that deals with the calculation of reactants and products in chemical reactions based on the balanced chemical equations.

Front

What is a balanced chemical equation?

Back

A balanced chemical equation has equal numbers of each type of atom on both sides of the equation, ensuring the law of conservation of mass is followed.

Front

What are coefficients in a chemical equation?

Back

Coefficients are the numbers placed in front of the compounds in a chemical equation that indicate the ratio of moles of each substance involved in the reaction.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass, sum the atomic masses of all the atoms in the compound's formula.

Front

What is the molar mass of NaCl?

Back

The molar mass of NaCl (sodium chloride) is approximately 58.44 g/mol.

Front

How many grams of O2 are produced from 2 moles of NaClO3?

Back

96 g of O2 are produced from 2 moles of NaClO3 based on the reaction 2NaClO3 → 2NaCl + 3O2.

Front

What is the mole ratio of NaClO3 to O2 in the reaction 2NaClO3 → 2NaCl + 3O2?

Back

The mole ratio of NaClO3 to O2 is 2:3.

Front

How many moles of H2 are needed to produce 2 moles of Fe in the reaction Fe2O3 + 3H2 → 2Fe + 3H2O?

Back

3 moles of H2 are needed to produce 2 moles of Fe.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a molecule, but they do not affect the mole ratio in a balanced equation.

Front

How do you determine the number of grams of a product formed in a reaction?

Back

Use the mole ratio from the balanced equation and the molar mass of the product to convert moles to grams.