Stoichiometry & Empirical Formula

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 an empirical formula?

Back

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

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in g/mol).

Front

What is the mole ratio in a balanced chemical equation?

Back

The mole ratio is the ratio of moles of one substance to the moles of another substance in a balanced chemical equation.

Front

How many moles of KCl can be produced from 2 moles of KBr in the reaction Cl₂ + 2KBr → Br₂ + 2KCl?

Back

2 moles of KCl can be produced from 2 moles of KBr.

Front

What is the first step in stoichiometric calculations?

Back

The first step is to write a balanced chemical equation for the reaction.

Front

How do you find the molar mass of a compound?

Back

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

Front

What is the significance of coefficients in a balanced equation?

Back

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

Front

If you have 40.05% S and 59.95% O, how do you find the empirical formula?

Back

Convert the percentages to grams, then to moles, and find the simplest whole-number ratio.

Front

What is the relationship between moles and volume at STP?

Back

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