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 conservation of mass.

Front

What does the law of conservation of mass state?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

How do you determine the number of moles from a balanced chemical equation?

Back

The coefficients in a balanced chemical equation represent the ratio of moles of each substance involved in the reaction.

Front

What is the molar mass of a substance?

Back

The molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How many moles of H2 are needed to produce 4 moles of Fe from Fe2O3?

Back

According to the equation Fe2O3 + 3H2 → 2Fe + 3H2O, 6 moles of H2 are needed to produce 4 moles of Fe.

Front

What is the relationship between volume and moles of gas at STP?

Back

At standard temperature and pressure (STP), 1 mole of an ideal gas occupies 22.4 liters.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms of each element is the same on both sides.

Front

What is the significance of the coefficients in a balanced equation?

Back

Coefficients indicate the relative number of moles of each substance involved in the reaction.

Front

How do you calculate the mass of a product formed in a reaction?

Back

To calculate the mass of a product, use the molar mass of the product and the number of moles produced from the balanced equation.

Front

What is the molar ratio in the reaction 2Al + 6HCl → 2AlCl3 + 3H2?

Back

The molar ratio is 2 moles of Al to 6 moles of HCl, which simplifies to 1:3.