CIE IGCSE Chemistry Moles

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 containing exactly 6.02 x 10^23 particles, which can be atoms, molecules, or ions.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of particles in one mole of a substance.

Front

How do you calculate the number of moles from particles?

Back

Number of moles = Number of particles / Avogadro's number.

Front

Calculate the number of moles in 3.10 x 10^23 particles.

Back

0.5 moles.

Front

What is the formula to calculate the mass of a substance in grams from moles?

Back

Mass (g) = Number of moles x Molar mass (g/mol).

Front

Determine the mass of 4.20 moles of C6H12.

Back

353 g.

Front

How do you calculate the number of atoms from grams of an element?

Back

Number of atoms = (Mass (g) / Molar mass (g/mol)) x Avogadro's number.

Front

Calculate the number of atoms in 0.0340 g of Zn.

Back

3.13 x 10^20 atoms Zn.

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).

Front

How do you find the molar mass of a compound?

Back

Add the molar masses of all the atoms in the compound's formula.