This is part 3 of Kinetics for Kinetics and Kinetics 2.
Rate =k[H2][NO]^2
exponential coefficient of H2 concentration is the order with respect to H2
Rate law =k[H2][NO]^2
Overall order is : 2+1
k = Rate /[H2][NO]^2
Plug in the value of rate and concentrations of H2 and NO from any of the experimental data
Units for 3rd order k is M^-2 s^-1