0.43g limestone and 98cm3 of carbon dioxide are produced on reaction with excess hydrochloric acid. How much calcium carbonate is present?

Answer 1

You have to know pressure, temp to do this.

Answer 2

Standard temp and pressure

Answer 3

I don't get it. Limestone IS CaCO3. The reaction of limestone with HCl is as follows. You need to rephrase because limestone is not produced by reaction with HCl.
CaCO3 + 2HCl ==> CO2 + H2O + CaCl2