Chapter 6, Problem 28P

Ammonia ( ${\text{NH}}_3$ ) decomposes to hydrogen and nitrogen and 22.0 kcal of energy isabsorbed.
   ${\text{2NH}}_3(g)\to {\text{ 3H}}_{\text{2}}(g)+{\text{N}}_{\text{2}}(g)$
How much energy is absorbed when 1.0 mol of ${\text{N}}_{\text{2}}$ is formed?
How much energy is absorbed when 1.0 mol of ${\text{NH}}_3$ reacts?
How much energy is absorbed when 3.50 g of ${\text{NH}}_3$ reacts?