Question

Under what conditions is AG for a reaction always positive?OA. When AH is positive and AS is negativeOB. When AH and AS are both negativeO C. When AH is negative and AS is positiveO D. When Hand AS are both positive

Answer 1

Step-by-step explanation:

ΔG = free Gibbs energy change

If a reaction is endothermic (gains heat), ΔH is positive, and entropy decreases, ΔS is negative. Then, ΔG must be positive.

So, ΔG (+) if ΔH (+) and ΔS (-)

Answer: OA. When ΔH is positive and ΔS is negative