Let the rate of reaction (r) is as r=K[NO]n[H2]m From 1st data 0.135=K[40]n⋅(65.6)m...(1) From 2nd data 0.033=K(20.1)n⋅(65.6)m...(2) On dividing equation (1) by equation (2)
0.135
0.033
=(
40
20.1
)n 4=(2)n ∴n=2 ∴ Order of reaction w.r.t. NO is 2 .