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 is the law of conservation of mass?

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 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 a limiting reactant?

Back

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

Front

How do you determine the theoretical yield of a reaction?

Back

The theoretical yield is calculated based on the stoichiometry of the balanced chemical equation and the amount of limiting reactant.

Front

What is percent yield?

Back

Percent yield is the ratio of the actual yield to the theoretical yield, multiplied by 100. It indicates the efficiency of a reaction.

Front

What is the balanced equation for the decomposition of potassium chlorate?

Back

2KClO3 → 2KCl + 3O2

Front

How many moles of a substance are in a given mass?

Back

To find moles, divide the mass of the substance by its molar mass (moles = mass/molar mass).

Front

What is the relationship between moles and volume for gases at STP?

Back

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

Front

How do you convert moles to grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance (grams = moles × molar mass).