Consider the reaction: N 2 ( g ) + 2 H 2 ( g ) N

Consider the reaction: 

N2 (g) + 2 H2 (g) ⟶ N2H4 (g)

The following data were collected:

Time (s)	[H2] (M)
0	0.100
40	0.067
80	0.045
120	0.030
160	0.020

a) Express the rate of the reaction in terms of the change in concentration of each of the reactants and products.

b) What is the average rate of the reaction between 40 s and 120 s?

c) Make a rough sketch of the concentrations of N2, H2, and N2H4 as a function of time.