Explanation:
Overall reaction :
C(s) + H2O(g) ⇌ CO(g) + H2(g)
First Reaction :
C(s) + O2(g) → CO2(g)
Second Reaction :
2 H2(g) + O2(g) → 2 H2O(g)
Third Reaction :
2CO(g) + O2 (g) → 2 CO2(g)
To obtain the overall reaction
- Multiply the first reaction by 2. The equation we have is;
2C(s) + 2O2(g) → 2CO2(g)
- Add the reaction with the reversed second reaction. The equation we have is given as;
2C(s) + 2O2(g) + 2 H2O(g) → 2 H2(g) + O2(g) + 2CO2(g)
Simplifying we have;
2C(s) + 2 H2O(g) + O2(g) → 2 H2(g) + 2CO2(g)
- Add the new equation with the reversed third equation. We have;
2C(s) + 2H2O(g) + 2CO2(g) + O2(g) → 2 H2(g) + 2CO2(g) + 2CO(g) + O2 (g)
Simplifying we have;
2C(s) + 2 H2O(g) → 2 H2(g) + 2CO(g)
Divide the reaction by 2. We have;
C(s) + H2O(g) ⇌ CO(g) + H2(g)
