i know PV=nRT but im not strong on stoichmetry. can someone explain step by step pls

Acid precipitation dripping on limestone produces carbon dioxide by the following reaction: CaCO3(s) +24+ (aq) Ca+ (aq) + CO2(g) +H20(1) 18.5 mL of CO2 was produced at 25.0C and738.0 mm Hg. 1st attempt Part 1 (1 point) l See Periodic Table See Hint How many moles of CO2 were produced? mol Part 2 (1 point) See Hint How many milligrams of CaCO3 were consumed? mg