At 298 K and constant pressure the heat of formation of C H2(g) and CH (8) is 230 and 85 kJmol-. What will be enthalpy change for the
reaction ?
3C2H2(g) → C6H.(g)
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11th
Chemistry
Thermodynamics
Enthalpy Change of a Reaction
If the heats of formation o...
CHEMISTRY
If the heats of formation of C
2
H
2
and C
6
H
6
are 230 KJ mol
−1
and 85 KJ mol
−1
respectively, the
ΔH value for the trimerisation of C
2
H
2
is:
HARD
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ANSWER
(i) 2C(s)+H
2
(g)→C
2
H
2
(ii) 6C(s)+3H
2
(g)→C
6
H
6
ΔH=85KJ
(iii) C
2
H
2
→2C(s)+H
2
(g)ΔH=−230KJ
(ii) + 3(iii) gives
3C
2
H
2
→C
6
H
6
ΔH=−230×3+85
=−690+85
=−605KJ
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