UNit 5 REVIEW- Moles, % Comp, Empirical/Molecular Formulas

Front

What is the percent composition of a compound?

Back

The percent composition of a compound is the percentage by mass of each element in the compound.

Front

How do you calculate the percent composition of C6H12O6?

Back

To calculate the percent composition, divide the mass of each element by the total molar mass of the compound and multiply by 100.

Front

What is an empirical formula?

Back

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

Front

What is a molecular formula?

Back

A molecular formula shows the actual number of atoms of each element in a molecule of a compound.

Front

How do you determine the empirical formula from a molecular formula?

Back

Divide the subscripts in the molecular formula by their greatest common divisor.

Front

What is the molar mass of H2O?

Back

The molar mass of H2O is approximately 18.02 g/mol.

Front

How many grams are in 1 mole of a substance?

Back

1 mole of a substance contains a mass equal to its molar mass in grams.

Front

What is the relationship between moles and grams?

Back

Moles = grams / molar mass.

Front

How do you convert moles to grams?

Back

Multiply the number of moles by the molar mass of the substance.

Front

What is the smallest molar mass among CO, CO2, H2O, and H2O2?

Back

H2O has the smallest molar mass.