Consider the following reaction :2Fe2O3(s)+3C(s)⟶4Fe(s)+3CO2(g)ΔH∘ of Fe2O3 and CO2 are −820 kJ/mol and −390 kJ/mol respectively.The reaction is :

exothermic , spontaneous at low temperature

ΔH = 3 × ( − 390 ) − 2 ( − 820 ) = 470 kJ / mol ΔG < 0 ; ΔH − TΔS < 0

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Consider the following reaction :
$2 {Fe}_{2} O_{3} (s) + 3 C (s) ⟶ 4 Fe (s) + 3 {CO}_{2} (g)$
${ΔH}^{\circ}$ of ${Fe}_{2} O_{3}$ and ${CO}_{2}$ are $- 820 kJ / mol$ and $- 390 kJ / mol$ respectively.
The reaction is :

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exothermic

endothermic

spontaneous at low temperature

spontaneous at high temperature

answer is A, C.

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$\begin{array}{l} ΔH = 3 \times (- 390) - 2 (- 820) \\ = 470 kJ / mol \\ ΔG < 0; ΔH - TΔS < 0 \end{array}$

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