Topic 3 - Masses In Reactions

Question 1

how do you calculate masses in reactions?

Answer 1

1. write out the balanced equation
2. work out Mᵣ of the reactant and product you’re interested in
3. find out how many moles are in the substance that you know the mass of
4. use the balanced equation to work out how many moles there’ll be of the other substance
5. use this to calculate the mass

Question 2

how do you calculate percentage yield?

Answer 2

percentage yield = actual yield / theoretical yield x 100

Question 3

what is a theoretical yield?

Answer 3

the mass calculated by the mass of reactant equation