Molar Mass

Front

What is Molar Mass?

Back

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

Front

How do you calculate the molar mass of a compound?

Back

Add the atomic masses of all the atoms in the compound's formula.

Front

What is the molar mass of Aluminum (Al)?

Back

27 g/mol.

Front

Calculate the molar mass of KOH (Potassium Hydroxide).

Back

The molar mass of KOH is 56 g/mol.

Front

What is the percent composition of Sodium (Na) in NaCl?

Back

39.3%.

Front

Find the molar mass of KCl (Potassium Chloride).

Back

The molar mass of KCl is 74.55 g/mol.

Front

If the molar mass of Cu2O is 143 g/mol, what is the percentage composition of Copper (Cu) in Cu2O?

Back

88.8%.

Front

What is the significance of percent composition in chemistry?

Back

It indicates the relative amount of each element in a compound.

Front

What is the molar mass of water (H2O)?

Back

The molar mass of H2O is 18 g/mol.

Front

How do you determine the empirical formula from percent composition?

Back

Convert percent to grams, then to moles, and simplify the ratio.