1. Unit 3 – Chemistry in Society Pupil Notes
CfE Higher Chemistry
Unit 3 – Chemistry in Society
Pupil Notes

2. Calculations from Equations
A balanced equation is taken to give the relative number of moles of each reactant and product. Since the mass of one mole of any substance is expressed in grams, the masses involved can then be calculated as shown.
Worked Example
Calculate the mass of water produced on burning 1g of methane
CH O2 CO H2O
1 mole moles
It is not necessary to calculate the masses of carbon dioxide and oxygen – these substances are not included in the question.

3. Calculations from Equations