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Phosphorus pentachloride is decomposed to phosphorus trichloride and chlorine (treated as perfect gases), with a reversible reaction as PC15(g) PC13(g) + Cl2(g). Assuming that standard reaction enthalpy and entropy are independent of temperature. Determine: (a) the standard reaction Gibbs energy at 25C from standard Gibbs of formation of compounds [5 Marks [CO2, PO2, C3] (b) the value of the equilibrium constant at 25C. [3 Marks [CO2, PO2, C3) (c) the value of the equilibrium constant at 50C. 17 Marks) [CO2, PO2, C3] (d) the percentage of phosphorus pentachloride decomposed at 50C if a reaction vessel is charged with an excess of phosphorus pentachloride and is heated to 50C. At equilibrium, the pressure of the uncomposed phosphorus pentachloride is 1.25 atm. [10 Marks [CO2, PO2, C4)