Moles

Question 1

What is a mole?

Answer 1

Convenient way of counting atoms
1 mole of a substance contains 6.022x10²³ atoms

Question 2

How is the relative atomic mass related?

Answer 2

Relative atomic mass = the mass of one mole of that element
For example one mole of magnesium has a mass of 24g, therefore it’s Ar is 24

Question 2

How is the relative formula mass related?

Answer 2

Relative formula mass = the mass of mole of that compound
For example a mole of water has a mass of 18g, as it’s Mr is 18.

Question 3

How to find the number of moles?

Answer 3

Mass = Number of moles x Mr or Ar
Number of moles = Mass/ Mr or Ar
Mr or Ar = Mass/ number of moles