The percentage of CO2 increased 48 percent. Hope this helped!
(i) The pH of HCl is between 0 and 2.
(ii) the presence of Carbon Dioxide turns lime water milky or sees a white precipitate form on the surface of the lime water. Lime water is CaOH and when it reacts with Carbon Dioxide it forms a white solid (precipitate) Calcium Carbonate.
Multiply amount in grams by the relative atomic mass of magnesium then multiply by avagodro constant (6.02*10^23)