Calculate the volume of carbon dioxide at 273 K and 1.01 * 10^5 Pa which would be produced when 1.25g of calcium carbonate reacts completely with...

1. Calculate the volume of carbon dioxide at 273 K and 1.01 * 10^5 Pa which would be produced when 1.25g of calcium carbonate reacts completely with HCL.and2. When 41.18 cm^3 of a solution of silver ions with concentration of .2040 mol dm^-3 is added to a solution of XO4 -3 ions 1.172g of precipitate are formed.i) calculate the amount in moles of Ag+ used in the reaction.ii)Calculate molar mass of precipitateiii)Determine the relative atomic mass of X and identify the element.thanks for the help even if you can't answer it! thanks!