what volume of CO2 would be formed if 84.2 g of calcium carbonate decomposed according to the following equation: CaCO3---> CaO+CO2
I assume you want the volume at STP conditions although that isn't posted in the problem.
1. Write the equation and balance it.
2. Convert 84.2 g CaCO3 to moles. moles = g/molar mass
3. Using the coefficients in the balanced equation, convert moles CaCO3 to moles CO2.
4. Now convert moles CO2 to L. L = moles x 22.4 L/mol.