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A certain reaction is nonspontaneous under standard conditions, but becomes spontaneous at higher temperatures. What conclusions may be drawn under standard conditions?

A certain reaction is nonspontaneous under standard conditions, but becomes spontaneous at higher temperatures. What conclusions may be drawn under standard conditions? Correct Answer ?H > 0, ?S > 0 and ?G > 0

D-The relationship, given on the equations page of the exam is ?G = ?H - T?S. Nonspontaneous under standard conditions means: ?G > 0. To become spontaneous, ?G must be less than zero. Increasing the temperature will change the T?S term (entropy). If ?H is greater than zero and ?S is also greater than zero, the combination will be positive as long as the ?H is greater than T?S. As the temperature increases, T?S will eventually become larger than ?H making the process spontaneous.

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