Calculate the equilibrium constant for the reaction at 400 K:
$space space 2 NOCl left parenthesis straight g right parenthesis space space space rightwards harpoon over leftwards harpoon space space space 2 NO left parenthesis straight g right parenthesis space plus space Cl subscript 2 left parenthesis straight g right parenthesis$
$increment subscript straight r straight H to the power of 0 space equals space 77.2 space KJ space mol to the power of negative 1 end exponent space and increment subscript straight r straight S to the power of 0 space equals space 122 space JK to the power of negative 1 end exponent space mol to the power of negative 1 end exponent space 400 space straight K.$

We know,
...(1)

Substituting the values in (1), we have,

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Thermodynamics

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