The mole

Describe the mole

• Amount of substance measured using a unit called ‘mol’

• Avogadros constant - number of particles in one mole - 6.02 × 10²³

• Number of moles = number of particles / 6.02 × 10²³

Describe molar mass

• Mass of one mole of something

• Unit = grams per mole (g mol^-1)

• Same as relative molecular mass, Mr

How do you calculate number of moles?

Moles = mass / mr

How do you calculate number of atoms?

Moles x 6.02 × 10²³

Describe the ideal gas equation

• Lets you find number of moles in a certain volume at any temp & pressure

• Pressure (Pa) x volume(M³) = moles x 8.314Jk^-1 mol^-1 x temp (K)

Describe gas volumes

• Molar gas volume (Dm³ Mol^-1) = Space that one mole of a gas occupies at a certain temp & pressure

• This is 24dm³mol^-1 at room temp & pressure

• Number of moles = volume in dm³ (24) / molar gas volume

Convert K into degrees

K = degrees + 273