Given that 3C(s)+2Fe2O3(s)→4Fe(s)+3CO2(g)ΔH∘=−93657kcal at 25∘C3C(s)+3O2(g)→3CO2(g) ΔH∘=−94050kcal at 25∘C The value of ΔHf∘(Fe2O3 is
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a
16.750 kcal
b
- 16.750 kcal
c
- 196.5 kcal
d
- 393 kcal
answer is C.
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Detailed Solution
2Fe(s)+3/2O2(g)→Fe2O3(s);ΔH=?Given,3C(s)+2Fe2O3(s)→4Fe(s)+3CO2(g);ΔH=−93657kcal And 3C(s)+3O2(g)→3CO2(g);ΔH=−94050kcalEquation (2) - (1)4Fe+3O2→2Fe2O3(s);ΔH=−393kcal∴2Fe+3/2O2→Fe2O3(s);ΔH=−196.5kcal at 25∘C