For CaCO s CaO s CO g ; the equilibrium constant (Kc and Kp) for the thermal decomposition of calcium carbonate is (a) c p CO K CO g ;K p (b) c p CaCO K CaCO s ;K p (c) c p CaO K CaO s ;K p (d) c p CaO K CO g ;K p

For heterogeneous chemical equilibrium 3 2 CaCO s CaO s CO g On the basis of the stoichiometric equation, we can write, 2 c 3 CaO s CO g K CaCO s Since [CaCO3(s)] and [CaO(s)] are both constant, therefore, modified equilibrium constant for the thermal decomposition of calcium carbonate will be 2 c 2 p CO K CO g or K p Effect of Stoichiometry on K