Chemistry , 24.01.2022 19:20

Under what conditions is AG for a reaction always positive?
A. When A His positive and AS is negative
O B. When AH and AS are both negative
C. When A His negative and ASis positive
O D. When A Hand AS are both positive

Step-by-step answers

Answered by an experienced expert Dr. Ranjana Bhatt

For any reaction to occur the relationship between change in Gibb's energy (∆G) , change in enthalpy (∆H) and change in entropy (∆S) is as follows-

∆G = ∆H- T ∆S

∆G= Change in Gibb's energy 

∆H = Change in enthalpy

∆S = Change in entropy 

If ,

∆H is positive and ∆S is negative -

∆G = ∆H - T( -∆S )

∆G = ∆H + T ∆S

Hence, option A is correct

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