A quantity of 25.0 mL of 6.0 M HCL solution is added to a 11.50g sample of an aqueous solution of lithium cabonate. The carbon dioxide gas that is generated is collected over water at 20.0 celsius and an atmospheric pressure of 725 torr. When the gas levels are equalized, the volume of the gas is found to be 225 mL. Calculate the percent lithium cabonate by mass in the carbonate solution. PLEASE SHOW ME HOW TO DO THIS.