1
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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 −283.0kJmol−1, 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 −111.7kJmol−1Sol. 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=ΔH1−ΔH2 =393.5−(−283) =−110.5kJ Δng=1−12 12 ΔU⊖=ΔH−ΔngRT −11.05−(−12)×8.314×10−3×298 =−111.7kJmol−1

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