From the data of `DeltaH` of the following reactions
`C(s)+1//2O_(2)(g) rarr CO(g), DeltaH=-110 kJ`
and `C(s)+H_(2)O(g) rarr CO(g)+H_(2)(g), DeltaH=132 kJ`
Calculate the mole composition of the mixture of steam and oxygen on being passed over coke at 1273 K, keeping the reaction temperature constant.

Explanation

From the question we see that the first reaction is exothermic and the second one is endothermic. Thus, if a mixture of oxygen and steam `(H_(2)O)` is passed over coke and at the same time, the temperature does not change, the composition should be such that `DeltaH` of both the reactions are numerically equal.
In the first reaction, consumption of `1//2` "mole" of `O_(2)` evolves 110 kJ of energy, while in the second reaction, for 1 mole of steam `(H_(2)O)`, 132 kJ of energy is absorbed.
`:. "mole"` of `O_(2)` needed to evolve `132kJ=(0.5)/(110)xx132=0.6`
`:. "mole"` ratio of `O_(2)` and steam `(H_(2)O)=0.6:1`.