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Question

The enthalpies of combustion of Carbon and Carbon monoxide in excess of oxygen at 298K and constant pressure are 393.5 and 283.0kJmol1, respectively. Calculate the heat of formation of Carbon monoxide at constant volume.

A
111.7kJmol1
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B
+111.7kJmol1
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C
100kJmol1
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D
None of these
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Solution

The correct option is A 111.7kJmol1
Sol. C(s)+12O2(s)CO(S)......
ΔH=?
Given: C(g)+O2(g)CO2(g);ΔH1=393.5.....
(i) CO(g)+12O2(g)CO2(s);ΔH2=283.....
(ii) ΔfH=ΔH1ΔH2
=393.5(283)
=110.5kJ
Δng=112
12 ΔU=ΔHΔngRT 11.05(12)×8.314×103×298
=111.7kJmol1

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