The heat combustion of methane at constant volume is -885 KJ/mol at 298 Kelvin. Calculate the heat of combustion at constant pressure. Using the equation ∆H=∆U+nRT
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CH
4
+2O
2
⟶CO
2
+2H
2
O;ΔH
1
=−890kJmol
−1
...(i)
C+O
2
⟶CO
2
;ΔH
2
=−393.5kJmol
−1
...(ii)
2H
2
+O
2
⟶2H
2
O;ΔH
3
=2×(−285.8)kJmol
−1
...(iii)
Required reaction →C+2H
2
⟶CH
4(g)
;ΔH
f
=?
From equation(ii)-(i)+(iii)
ΔH
f
=(−393.5)+890.3+2(−285.8)=−74kJmol
−1
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