Molar Mass Conversions

Front

What is molar mass?

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all atoms in a molecule.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass of a compound, add together the molar masses of each element in the compound, multiplied by the number of times each element appears in the formula.

Front

What is the molar mass of water (H2O)?

Back

18 grams per mole.

Front

What is the molar mass of sodium chloride (NaCl)?

Back

58 grams per mole.

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

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

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 (in g/mol).

Front

What is the mass of 2.50 moles of oxygen gas (O2)?

Back

80.0 grams.

Front

How many moles are in 32 grams of oxygen (O)?

Back

2 moles.

Front

How many moles are in 20 grams of calcium (Ca)?

Back

0.5 moles.