The expression for entropy change given by, $$\Delta {\text{S}} = {\text{nR}}l{\text{n}}\left( {\frac{{{{\text{V}}_2}}}{{{{\text{V}}_1}}}} \right) + {\text{n}}{{\text{C}}_{\text{v}}}l{\text{n}}\left( {\frac{{{{\text{T}}_2}}}{{{{\text{T}}_1}}}} \right)$$ is valid for
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