Moles - SC9

Question 1

What are moles?

Answer 1

the Avogadro constant number of particles

Question 2

Calculate moles when given mass ( and vis versa)

Answer 2

moles = mass/mr and mass = moles x mr

Question 3

Explain that the mass of a product formed in a reaction is controlled by the mass of reactant that is not in excess

Answer 3

The product not in excess controls the experiment because as soon as it runs out the reaction cannot continue and hence the mass of product stops gaining