\( \mathrm{X} \) is a metal that forms an oxide \( \mathrm{X}_{2} \mathrm{O} \) \[ \frac{1}{2} \...
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0\( \mathrm{X} \) is a metal that forms an oxide \( \mathrm{X}_{2} \mathrm{O} \)
\[
\frac{1}{2} \mathrm{X}_{2} \mathrm{O} \longrightarrow \mathrm{X}+\frac{1}{4} \mathrm{O}_{2} ; \Delta \mathrm{H}=120 \mathrm{Kcal}
\]
\( \mathrm{P} \)
When a sample of metal \( \mathrm{X} \) reacts with one mole of oxygen, what will be the \( \Delta \mathrm{H} \) in that case?
W
(A) \( 480 \mathrm{kcal} \)
(B) \( -240 \mathrm{kcal} \)
(C) \( -480 \mathrm{kcal} \)
(D) \( 240 \mathrm{kcal} \)
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