Chapter 13, Problem 13.6QP

Write the reaction rate expressions for the following reactions in terms of the disappearance of the reactants and the appearance of products:

(a) ${\text{2H}}_{\text{2}}\left(g\right)+{\text{O}}_{\text{2}}\left(g\right)\stackrel{}{\to }{\text{2H}}_{\text{2}}\text{O}\left(g\right)$

(b) ${\text{4NH}}_{\text{3}}\left(g\right)+{\text{5O}}_{\text{2}}\left(g\right)\stackrel{}{\to }\text{4NO}\left(g\right)+{\text{6H}}_{\text{2}}\text{O}\left(g\right)$