For the reaction 2NOCl(g)$\rightleftharpoons$ 2NO(g) + Cl2(g), ΔHo = 18 kcal and ΔSo = 30 cal/K at 3

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For the reaction 2NOCl(g)$\rightleftharpoons$ 2NO(g) + Cl2(g), ΔHo = 18 kcal and ΔSo = 30 cal/K at 300 K. The equilibrium constant KPo for the reaction at 300 K is

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ΔG° = ΔH° – T.ΔS° = –RT.ln Kp°$	ext{Or, }18 - 300 	imes \frac{30}{1000} = - \frac{2}{1000} 	imes 300 	imes \ln K_{p}^{o} $$$	ext{Or, }\ln K_{p}^{o} = - 15 \Rightarrow K_{p}^{o} = e^{- 15}$$

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