Moles Review

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, ions, etc.) as there are atoms in 12 grams of carbon-12.

Front

How do you calculate the number of moles from volume of gas?

Back

Use the formula: Moles = Volume (L) / 22.4 L/mol (at STP).

Front

What is the molar mass of (NH4)3PO4?

Back

The molar mass is 149.09 g/mol.

Front

How do you find the mass of a substance from moles?

Back

Use the formula: Mass (g) = Moles x Molar Mass (g/mol).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of particles in one mole of a substance.

Front

How do you convert grams to moles?

Back

Use the formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the formula to find the number of particles from moles?

Back

Number of particles = Moles x Avogadro's number.

Front

What is the name of the compound Ba(OH)2?

Back

Barium hydroxide.

Front

How many molecules are in 1 mole of a substance?

Back

1 mole of a substance contains 6.022 x 10^23 molecules.

Front

What is the relationship between moles and volume for gases at STP?

Back

At STP, 1 mole of any gas occupies 22.4 liters.