The Mole PreAssessment

Front

What is the molar mass of fluorine gas?

Back

The molar mass of fluorine gas (F2) is 38 g/mol.

Front

What is the mass of one mole of AuCl3?

Back

The mass of one mole of AuCl3 is 303.5 g.

Front

What percent of nitrogen, by mass, is in a sample of Al(NO3)3?

Back

The percent of nitrogen by mass in Al(NO3)3 is 20%.

Front

What % of oxygen, by mass, is there in a sample of CuSO4?

Back

The percent of oxygen by mass in CuSO4 is 40%.

Front

How do you determine the formula of a hydrate?

Back

To determine the formula of a hydrate, calculate the mass of water lost and use the molar mass of the anhydrous compound to find the number of water molecules.

Front

What is the formula for calculating molar mass?

Back

Molar mass = sum of the atomic masses of all atoms in the compound.

Front

What is a hydrate?

Back

A hydrate is a compound that contains water molecules within its structure.

Front

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

Back

Percent composition = (mass of element in 1 mole of compound / molar mass of compound) x 100%.

Front

What is the significance of the mole in chemistry?

Back

The mole is a unit that measures the amount of substance, allowing chemists to count particles by weighing them.

Front

What is the relationship between moles and mass?

Back

Mass (g) = number of moles x molar mass (g/mol).