Determine the percentage of calcium carbonate (CaCO3) in a rock sample. You crush up a 20g sample and dissolve it in excess dilutre hydrochloric acid. The evolved gas (CO2) is collected under water and at 25 degrees celcius and 100Kpa the volume is found to be 3.43Litres.
a) Calculate the number of moles of CO2 evolved.
b) Calculate the percentage of calcium barbonate present in the rock.
I think the formula turns out to be:
CaCO[size=9]3[/size] + 2 HCL --> CaCl[size=9]2[/size] + H[size=9]2[/size]O + CO[size=9]2[/size]
Plz help me. Working out would be most helpful.