Write a balanced equation for each of the following reactions:
(a) Hydrogen cyanide is formed commercially by passing a mixture of methane, ammonia, and air over a catalyst at 800°C.Water is a by-product of the reaction.
(b) Baking soda reacts with acids to produce carbon dioxide gas.
(c) When barium carbonate reacts in air with sulfur dioxide, barium sulfate and carbon dioxide form.