Alls. (Vog (1) Rug
PROBLEM 28. Calculate the enthalpy of the reaction CH4 ()+H2(g)--> CH6(g)at 298 K given that the
398K
Ans. - 1350
TIVITATIONS OF FIRST LAW OF THERMODYNAMICS NEED OF
orthalpies of combustion of ethylene, hydrogen and ethane are - 1410.01.-286.2 and -1560.6 kJ respectively, at
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Answer:
Given.
H
2
(g)+
2
1
O
2
(g)⟶H
2
O(g);ΔH
∘
=−285.8kJ ...(i)
CH
4
(g)+2O
2
(g)⟶CO
2
(g)+2H
2
O(g)ΔH
∘
=−890.0kJ ...(ii)
C
2
H
6
(g)+(7/2)O
2
(g)⟶2CO
2
(g)+3H
2
O(g);ΔH
∘
=−1560.0kJ ...(iii)
3C(s)+4H
2
(g)⟶C
3
H
8
(g);ΔH
∘
=−103.8kJ ...(iv)
C(s)+O
2
(g)⟶CO
2
(g);ΔH
∘
=−393.5kJ ... (v)
By inspection method
5×(i)+3×(v)−[(ii)+(iii)+(iv)]
H
2
(g)+C
3
H
8
(g)⟶CH
4
(g)+C
2
H
8
(g);ΔH
∘
=−55.7kJ
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