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Question: What will be heat of reaction for the following reaction? Will the reaction be exothermic or endothe...

What will be heat of reaction for the following reaction? Will the reaction be exothermic or endothermic?

Fe2O2(g)+3H2(g)→2Fe(s)+3H2O(l)Fe_{2}O_{2(g)} + 3H_{2(g)} \rightarrow 2Fe_{(s)} + 3H_{2}O_{(l)}

ΔfHo(H2O,l)=−285.83kJmol−1\Delta_{f}H^{o}(H_{2}O,l) = - 285.83kJmol^{- 1}

ΔfHo(Fe2O3,s)=−824.2kJmol−1\Delta_{f}H^{o}(Fe_{2}O_{3,}s) = - 824.2kJmol^{- 1}

A

−824.2kJmol−1,- 824.2kJmol^{- 1}, exothermic

B

+33.3kJmol−1,+ 33.3kJmol^{- 1}, endothermic

C

−33.3kJmol−1,- 33.3kJmol^{- 1}, exothermic

D

+824.2kJmol−1,+ 824.2kJmol^{- 1}, endothermic

Answer

−33.3kJmol−1,- 33.3kJmol^{- 1}, exothermic

Explanation

Solution

:ΔfHo(Fe(s))=0,ΔfHo(H2(g))=0\Delta_{f}H^{o}(Fe_{(s)}) = 0,\Delta_{f}H^{o}(H_{2(g)}) = 0

ΔrHo=3(−285.83)−1(−824.2)\Delta_{r}H^{o} = 3( - 285.83) - 1( - 824.2)

=−857.5+824.2=−33.3kJmol−1= - 857.5 + 824.2 = - 33.3kJmol^{- 1}

Reaction is exothermic.