When 0.200 mol of CaCO(s) and 0.300 mol of CaO(s) are placed in an evacuated, sealed 10.0-L container and heated to 1039 K, PCO = 0.220 atm after equilibrium is established. CaCO(s) CaO(s) + CO(g) Additional CO(g) is pumped into the container to raise the pressure to 0.550 atm. After equilibrium is re-established, what is the total mass (in g) of CaCO in the container?