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  4. If Δ H=- text 25kcal, text T=300 text K and Δ S=9 text cal, then the reaction is

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Q. If $ \Delta H=-\text{ }25kcal,\text{ }T=300\text{ }K $ and $ \Delta S=9\text{ }cal, $ then the reaction is

JamiaJamia 2012

Solution:

$ \Delta G=\Delta H-\Delta .S $ $ \because $ $ \Delta H=-25\,kcal=-25000\,cal $ $ T=300K,\text{ }\Delta S=9cal $ $ \Delta G=-25000-300\times 9 $ $ =-25000-2700 $ $ \Delta G=-27700\text{ }cal $ The value of $ \Delta G $ is negative, hence the reaction is spontaneous.