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What should be the free energy so that reaction is spontaneous?

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What should be the free energy so that reaction is spontaneous?

(a) Positive

(b) Negative

(c) Neutral

(d) None of the mentioned

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I'd like to ask this question from Thermodynamics and Kinetics topic in portion Hydrolysis of Unit Processes

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The correct choice is (b) Negative

To elaborate: If the free energy change is negative the reaction is spontaneous and becomes more favourable with increasing (-dF); on the other hand if the free energy change is positive and greater than 10 kg-cal per mole the reaction is not suitable for practical application.

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