Formula Mass, Moles, and Molar Mass

Front

What is the definition of molar mass?

Back

Molar mass is 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

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

Front

What is the molar mass of KOH?

Back

56 g/mol

Front

What is the molar mass of Cl₂?

Back

71.0 g/mol

Front

What are the units of molar mass?

Back

g/mol

Front

What is the mass of one mole of aluminum?

Back

27 g

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10²³, which is the number of particles in one mole of a substance.

Front

To convert between mass and moles of a substance, what conversion factor is used?

Back

Molar mass.

Front

What is the molar mass of water (H₂O)?

Back

18 g/mol

Front

How many moles are in 54 grams of aluminum?

Back

2 moles (since 27 g/mol for aluminum).