Chemistry, 4.3- Quantitative chemistry.

Use [X] to replace multiply.

Write down the equation which link moles, mass and relative formula mass(Mr). [1 mark]

Mole = mass / relative formula mass

There are 2 moles of calcium oxide.

Calculate the number of atom in 2 moles of calcium oxide. [2 marks]

Number of molecule in 2 moles:

• 2 X 6.02 X 10²³ = 1.204 X 10²⁴

Number of atom in 2 moles of calcium oxide.

• 2 X 1.204 X 10²⁴ = 2.408 X 10²⁴

Write down the equation which link concentration, mass, and volume. [1 mark]

Concentration = mass / volume

Write down the equation which link concentration, volume, and moles. [1 mark]

Write down the equation which link volume and moles at room temperature and pressure. [1 mark]

Volume = moles X 24