Chapter 7.8, Problem 7.61PP

Ammonia and oxygen react to form nitrogen and water.
${\text{4NH}}_{\text{3}}\left(g\right)+{\text{ 3O}}_{\text{2}}\left(g\right)\to {\text{2N}}_{\text{2}}\left(g\right)+{\text{ 6H}}_{\text{2}}\text{O}\left(g\right)$

a. How many grams of ${\text{O}}_{\text{2}}$ are needed to react with 13.6 g of ${\text{NH}}_{\text{3}}$ ?
b. How many grams of ${\text{N}}_{\text{2}}$ can be produced when 6.50 g of ${\text{O}}_{\text{2}}$ reacts?
c. How many grams of ${\text{H}}_{\text{2}}\text{O}$ are formed from the reaction of 34.0 g of ${\text{NH}}_{\text{3}}$ ?