A chemical engineer injects limestone into the hot flue gas of a coal burning power plant to form lime, which scrubs SO2 from the gas and forms gypsum (CaSO4.2H2O). Find Kc for the following reaction
CaCO3(s) <--> CaO(s) + CO2(g)
if the value for Kp at 1000 K is 2.1*10^-4