Question

The value of AG° at 25 °C for the following reaction: C2H4 (g) + H2 (g) → C2H6 (g) is kJ/mol. At 298 K, AH° for this reaction is -137.5 kJ/mol, and ASº is +120.5 J/K. 35800 A. -101.7 B. -173.4 C. -35800 D. 0 E.

Answer 1

Dear sudent, here given at T =25°C = 298 K, ΔH° = -137.5 KJ/mol, ΔS° = +120.5 J/K and we have to find ΔG°.

As we know,

$\Delta G^{\circ}= \Delta H^{\circ}-T \Delta S^{\circ}$

$\therefore \Delta G^{\circ}= -137500-298\times (+120.5)$

$\therefore \Delta G^{\circ}= -137500-35909$

$\therefore \Delta G^{\circ}= -172809$

$\therefore \Delta G^{\circ}= -173.0 KJ/mol$

So, the option C. -173.4 KJ/mol is the correct answer.

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