The Mole

Question 1

What is the amount of substance?

Answer 1

• It is a quantity referred to as n to count the number of particles in a substance.
• Measured in a unit called the mole (mol).

Question 2

Avogadro Constant

Answer 2

• The Avogadro constant is 6.02 x 10^23 mol-1, the number of particles in each mole of carbon-12.
• 1 mole is the amount of a substance that contains 6.02 x 10^23 particles.

Question 3

Molar mass

Answer 3

• Mass per mole of a substance. Units: gmol-1

- n=m/Mr

Question 4

Molar gas volume

Answer 4

• The volume per mole of gas molecules at a stated temperature and pressure.
• At RTP, 1 mole of gas molecules has a volume of approx. 24 dm3
• At RTP molar gas volume is 24dm3mol-1
• n = v (dm3) / 24