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Question

From the following data at 25C, The standard enthalpy of formation of FeO(s) is X, then 0.3-X is:

ReactionΔrH ( kJ / mole )
Fe2O3(s)+3C(graphite)2Fe(s)+3CO(g)492.6
FeO(s)+C(graphite)Fe(s)+CO(g)155.8
C(graphite)+O2(g)CO2(g)393.51
CO(g)+1/2O2(g)CO2(g)282.98

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Solution

FeO(s)+C(graphite)Fe(s)+CO(g),155.8
CO(g)+12O2(g)CO2(g),282.98
+
FeO(s)+C(graphite)+12O2(g)Fe(s)+CO2(g),H=127.18
C+O2CO2,393.51
-
FeO12O2Fe,266.33
Fe+12O2FeO,H=266.33
0.3(266.33)=266.63267

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