Background Information
This is a neutralisation reaction between an acid (sulfuric acid) and a base (copper carbonate). When a carbonate reacts with an acid, the products are a salt, carbon dioxide and water.
carbonate + acid --> salt + carbon dioxide + water
ATTENTION: If you are NOT familiarised with these reactions, I advise first to revise and then try to solve the question.
Example
First thing to do when we tackle problem like this one is to write down the balanced equation (if it is not given)
CuCO3 + H2SO4 --> CuSO4 + CO2 + H2O
RFM (CuCO3) = 124 g mol-1
Number of moles of CuCO3 = 6.2 g / 124 g mol-1 = 0.05 mol
For every 1 mole of CuCO3, 1 mole of CO2 is produced (Using the stoichiometry of the equation)
Number of moles of CO2 = 0.05 mol
Volume of CO2 gas released = 0.05 mol * 24 dm3 = 1.2 dm3 = 12000 cm3