Consider the following reaction.

A (g) + B (g) → C (g) + D (g)

*In one experiment the concentration of A (g) was monitored in the presence of a large excess of B (g) ( [B]_o = 0.750 M ) .

Time (s) [A] (mol/L)

0.00 6.00 x 10^-6

1.00 5.00 x 10^-6

5.00 2.40 x 10^-6

7.00 1.70 x 10^-6

10.00 0.99 x 10^-6

In a second experiment the concentration of B (g) was monitored in the presence of a large excess of A (g) ( [A]_o = 1.50 M ) .

Time (s) [B] (mol/L)

0.00 1.00 x 10^-4

0.50 0.84 x 10^-4

1.00 0.70 x 10^-4

2.00 0.49 x 10^-4

3.00 0.34 x 10^-4

(a) Determine the differential rate law for this reaction.

(b) Determine the value of the rate constant for this reaction.