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Question

From the following data of ΔH, of the following reaction,
C(s)+12O2(g)CO(g); ΔH=110kJ
C(s)+H2O(g)CO(g)+H2(g); ΔH=132kJ

What is the mole composition of the mixture of oxygen and steam on being passed over coke at 1273K, to keep temperature constant ?

A
0.5 : 1
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B
0.6 : 1
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C
0.8 : 1
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D
1 : 1
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Solution

The correct option is C 0.6 : 1
For the system to be in isothermal condition, total enthalpy must be 0.
From energy conservation and thermodynamics,

110×x×2+132×y=0

220x+132y=0

y/x=220/132=5:3

Hence, x:y=3:5=0.6:1

Hence, option B is correct

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