Equilibrium constant Kp for following reaction MgCO3(s) $\rightleftharpoons$ MgO(s) + CO2(g)

Question

Equilibrium constant K_p for following reaction
MgCO_3(s) $\rightleftharpoons$ MgO_(s) + CO_2(g)

K_p = P_CO₂

K_p = P_CO₂ $ \times $ ${{{P_{C{O_2}}} \times {P_{MgO}}} \over {{P_{MgC{O_3}}}}}$

K_p = ${{{P_{C{O_2}}} + {P_{MgO}}} \over {{P_{MgC{O_3}}}}}$

K_p = ${{{P_{MgC{O_3}}}} \over {{P_{C{O_2}}} + {P_{MgO}}}}$

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