R=K[NO]²[Cl2]¹
When we look at the rate of reaction formula,
we can see exponent of [NO] =2, that means that order of reaction with respect to NO equals 2.
We can see that exponent of [Cl2] =1, that means that order of reaction with respect to Cl2 equals 1.
Overall order of reaction = 2+1 = 3
If concentration of NO is tripled, then
R=K[NO]²[Cl2]
R1=K(3[NO])²[Cl2]=9K[NO]²[Cl2]=9R.
If the concentration of NO is tripled, then rate will increase 9 times.