Mole Conversions RVHS

Front

What is the definition of molar mass?

Back

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

Front

What is the molar mass of carbon dioxide (CO2)?

Back

44.01 g/mol.

Front

How do you calculate the percentage composition of an element in a compound?

Back

(Mass of the element in 1 mole of the compound / Molar mass of the compound) x 100.

Front

What is the percentage of carbon in carbon monoxide (CO)?

Back

42.87%.

Front

What is the molar mass of magnesium bromide (MgBr2)?

Back

The molar mass is calculated as follows: Mg (24.31 g/mol) + 2 x Br (79.90 g/mol) = 24.31 + 159.80 = 184.11 g/mol.

Front

What is the percentage of magnesium in magnesium bromide (MgBr2)?

Back

(24.31 g/mol / 184.11 g/mol) x 100 = 13.20%.

Front

What is Avogadro's Number?

Back

6.02 x 10^23, which is the number of particles (atoms, molecules, etc.) in one mole of a substance.

Front

Why is Avogadro's Number important in chemistry?

Back

It allows chemists to convert between the number of atoms/molecules and the amount of substance in moles.

Front

What is the relationship between moles and mass?

Back

Mass (g) = Moles x Molar Mass (g/mol).

Front

How do you convert grams to moles?

Back

Moles = Mass (g) / Molar Mass (g/mol).