The equilibrium constant KP for the reaction: CO (g) + Cl2 (g) COCl2 (g)
is 5.62 × 10^35 at 25 ° C. Calculate ΔG °˅f for COCl˅2 at 25 ° C.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.

Sorry i think the answer is b

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