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At '473 K', equilibrium constant Kc for ...

At '473 K', equilibrium constant Kc for decomposition of phosphorus pentachloride 'PCl_5' is '8.3 xx 10^(-3) .' If decomposition is depicted as,
'PCl_5(g) hArr PCl_3(g)+Cl_2(g) , Delta, H^circ=124.0 kJmol^(-1)'
a. write an expression for 'K_c' for the reaction
b. what is the value of 'K_c' for the reverse reaction at the same temperature?
c. what would be the effect on 'K' c if (i) more 'PCl_5' is added (ii) pressure is increased. (iii) the temperature is increased?

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