The standard molar heat of formation of ethane, CO2 and water (l) are −21.2,−94.1 and −68.3 kcal respectively. The standard molar heat of combustion of ethane will be ?
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class 11
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Answered by
1
Explanation:
2C(s) +3H
2
(g) → C
2
H
6
(g)
ΔH
f=-21.1 kcal
C(s) +O
2
(g) → CO
2
(g)
ΔH
f=-94.1 kcal
H
2
(s) +
2
1
O
2
(g) → H
2
O(l)
ΔH
f=-68.3 kcal
C
2
H
6
+
2
1
O
2
→ 2CO
2
+ 3 H
2
O
ΔH
f
′
ΔH
f
′
=(21.1) -(2 X 91.1) -(68.3 x 3)
=-372 kcal mor
−1
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