The heats of combustion of carbon, hydrogen and ethane are -94, -68.3 and -373kcal/mole respectively. The heat of formation of ethane in K.cal/mole is
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The heats of combustion of carbon, hydrogen and ethane are -94, -68.3 and -373kcal/mole respectively. The heat of formation of ethane in K.cal/mole is
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Answer:
H
2
+
2
1
O
2
⟶H
2
O+68.4........(i)
C
2
H
4
+3O
2
⟶2CO
2
+2H
2
O+3337.0......(ii)
C
2
H
6
+
2
7
O
2
⟶2CO
2
+3H
2
O+372.79.....(iii)
Onreversing eq (iii) we get
2CO
2
+3H
2
O+372.79⟶c
2
H
6
+
2
7
O
2
.....(iv)
On adding Eqs. (i),(ii),(iv) we get
C
2
H
4
+H
2
+372.79=C
2
H
6
+68.4+337
C
2
H
4
+H
2
⟶C
2
H
6
+32.61
ΔH=−32.61kcal