Question

Find the overall order of the following reactions: 
1. CHCl_3(g) + Cl_2(g) → CCl_4(g) + HCl_(g), Rate = k[CHCl₃][Cl₂]
2. 2NO_(g) + O_2(g) → 2NO_2(g),  Rate = k[NO]²[O₂]

Answer 1

1. Overall order of reaction for
CHCl_3(g) + Cl_2(g) → CCl_4(g) + HCl_(g)
Rate = k [CHCl₃][Cl₂]
The reaction is first order with respect to CHCl₃ and first order with respect to Cl₂.
Hence, the overall order of reaction is 1 + 1 = 2.

2. Overall order of reaction for
2NO_(g) + O_2(g) → 2NO_2(g)
Rate = k [NO]² [O₂]
The reaction is second order with respect to NO and first order with respect to O₂.
Hence, the overall order ofreaction is 2 + 1 = 3.