Question

For a particular reversible reaction at temperature T, $\Delta$H and $\Delta$S were found to be both +ve. If Te is the temperature at equilibrium, the reaction would be spontaneous when.

• A. Te> T
• B. T > Te
• C. Te is 5 times T
• D. T = Te

Answer 1

Answer: (B)

T > Te

Answer 2

$\Delta$G = $\Delta$H – T$\Delta$S

For spontaneous reaction $\Delta$G must be negative

At equilibrium temperature $\Delta$G = 0

to maintain the negative value of $\Delta$G

T should be greater than Te .