An unknown solid is introduced into a rigid 3.00-L vessel, the vessel is sealed, and the temperature is raised to 500K. At this temperature, the A2C vaporizes and decomposes according to the reaction:   A2C (s) ----> 2 A (g) + 2 C (l), Kc= 6.90x10-5   What is the equilibrium partial pressure of A?

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