High cost and limited availability of a reactant often dictate which reactant is limiting in a particular process. Identify the limiting reactant when the reactions below are run, and come up with a reason to support your decision.
a. Burning charcoal on a grill:
C(s) + O2(g) → CO2(g)
b. Burning a chunk of Mg in water:
Mg(s) + 2H2O(l) → Mg(OH)2(aq) + H2(g)
c. The Haber process of ammonia production:
3H2(g) + N2(g) → 2NH3(g)