Question

For the reaction 4A(g) + 3B(g) rightarrow 2C((g) The following data were obtained at constant temperature: Determine the reaction order with respect to each reactant. Make sure your answer is in number form. For example, zero order as 0, first as 1, second as 2 and so on. Reaction order for A: Reaction order for B:

Answer 1

4A(g) + 3B(g) $\rightarrow$ 2C(g)

rate = k [A]ⁿ [B]^m

Comparing experiment 1 and 3, when concentration [B] is increased by 2 times keeping concentration [A] constant, the initial rate increases by 2 times.

2 rate = k [2B]^m

$\Rightarrow$   2 rate = k  [2B]¹

m = 1

So, Reaction order for B is 1.

Again, comparing experiment 3 and 4, when concentration [A] is increased by 3 times keeping concentration [B] constant, the initial rate increases by 9 times.

9 rate = k [3A]ⁿ

$\Rightarrow$ 9 rate = k  [3B]²

$\Rightarrow$ n = 2

So, Reaction order for A is 2.