Exams › NEET › Chemistry

For a given reaction, ΔH = -35.5 kJ mol⁻¹ and ΔS = 83.6 J K⁻¹ mol⁻¹. The reaction is spontaneous at: (Assume that ΔH and ΔS do not vary with temperature)

1. T > 425 K
2. All temperatures
3. T > 298 K
4. T < 425 K

Correct answer: T > 425 K

Solution

The reaction is spontaneous when ΔG < 0. Solving ΔH - TΔS < 0 gives T > ΔH/ΔS, which leads to T > 425 K.

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