3. Moles and volumes

Volume Measurements

• cm³ or ml (1cm³ = 1ml)

• dm³ or l (1dm³ = 1000cm³ = 1000ml = 1l)

Converting between Solution Volumes and Moles

• n = c x V/1000 (cm³)

Mass Concentration Unit

• gdm^-3

Molar Gas Volume

• The volume per mole of gas molecules at a stated temperature and pressure

Factors affecting the Volume of a Gas

• Pressure

• Temperature

RTP - what is it?

• RTP - 20°c - 101 kPa

• At RTP, 1 mole of gas molecules has a volume of about 24.0dm³ (24,000 cm³)

Conversion between amount in Moles and Gas Volume

• amount = volume/molar gas volume

Factors making an Ideal Gas

• Random motion

• Elastic collisions

• Negligible size

• No intermolecular forces

Ideal Gas Calculation

• pV = nRT 

Information to use in an Ideal Gas Equation

• 8.314J-mol^-1 (Ideal Gas Constant - R)

• n + 273 - Kelvin