AP Chemistry--Stoichiometry Plus

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

Define a hydrate.

Back

A hydrate is a compound that contains water molecules within its structure, typically represented as a solid with a specific number of water molecules attached.

Front

How do you determine the formula of a hydrate?

Back

To determine the formula of a hydrate, calculate the mass of water lost during heating, then use the molar mass of the anhydrous compound and water to find the ratio of moles.

Front

What is the empirical formula?

Back

The empirical formula is the simplest whole-number ratio of atoms of each element in a compound.

Front

How do you calculate the empirical formula from percent composition?

Back

Convert the percentage of each element to grams, then to moles, and simplify the mole ratio to the smallest whole numbers.

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 identify the limiting reactant in a reaction?

Back

To identify the limiting reactant, calculate the moles of each reactant and determine which one produces the least amount of product.

Front

What is the molar mass of a compound?

Back

The molar mass is the mass of one mole of a substance, calculated by summing the atomic masses of all atoms in its formula.

Front

How do you convert molecules to grams?

Back

To convert molecules to grams, first convert molecules to moles using Avogadro's number, then multiply by the molar mass.

Front

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

Back

Coefficients indicate the relative number of moles of each reactant and product involved in the reaction.