Explanation:

In order to write the rate law we multiply the concentration fo each reactant with order of each reactant raised as the powers .So, in general Order with respect to A = n

- Order with respect to B = m
- Order with respect to A = n
- Order with respect to C = p

so, far the reaction given above the order with respect to P4 is 0 and H2 is 1 so, the rate law is

rate = k[H2]^{1}[P4]^{0}

= k [H2]

Answer:

rate = k [H2]

Topic: