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Q.

If the heats of formation of Al2O3 and Fe2O3 are –400 K.Cal and –190 K.Cal respectively, the heat of the following reaction is
2Fe + Al2O3   2Al + Fe2O3

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a

590 K.Cal

b

210 K.Cal

c

–210 K.Cal

d

–590 K.Cal

answer is D.

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Detailed Solution

rH=(2fHAl+fHFe2O3)-(2fHFe+fHAl2O3)

=(0-190)-(-400+0)=210Kcal

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If the heats of formation of Al2O3 and Fe2O3 are –400 K.Cal and –190 K.Cal respectively, the heat of the following reaction is2Fe + Al2O3 →  2Al + Fe2O3