Natural gas consists primarily of methane, CH4. It is used in a process called steam reforming to prepare a gaseous mixture of carbon monoxide and hydrogen for industrial use.
CH4(g) + H2O(g) → CO(g) + 3H2(g);
H × 206 kJ
The reverse reaction, the reaction of carbon monoxide and hydrogen, has been explored as a way to prepare methane (synthetic natural gas). Which of the following are exothermic? Of these, which one is the most exothermic?
a. CH4(g) + H2O(g) → CO(g) + 3H2(g)
b. 2CH4(g) + 2H2O(g) → 2CO(g) + 6H2(g)
c. CO(g) + 3H2(g) → CH4(g) + H2O(g)
d. 2CO(g) + 6H2(g) → 2CH4(g) + 2H2O(g)