1.27 carry out mole calculations using volumes and molar concentrations

For this we need to use a few equations (it is best to show with an example)...

Calculate the volume of carbon dioxide produced when 50g of calcium carbonate is decomposed by heating.


Step 1 - Calculate the amount, in moles, of calcium carbonate reacted

work out the Mr of CaCO... it's 100 

Therefore, we can work out the amount, in moles, of calcium carbonate that was reacted...

Amount, in moles, of CaCO₃ = (50 ÷ 100) = 0.5 mol



Step 2 - Calculate the amount, in moles, of carbon dioxide formed

CaCO₃ ------> CaO + CO₂
 
1 mol of CaCO₃ produces 1 mol of CO₂, therefore, 0.5 mol of CaCO₃ must produce 0.5 mol of CO₂

Step 3 - Calculate the volume of CO₂ formed

Volume of CO₂ (in dm3) = (0.5 x 24) dm³ = 12dm³

So, the volume of carbon dioxide produced when 50g of calcium carbonate is decomposed by heating, is 12dm3