Question

$N_2+3H_2\to 2N{H}_3$

What is the rate law expression for the above given reaction?

• A. rate $=\frac{[N{H}_3{]}^2}{\left[N_2\right][H_2{]}^3}$
• B. rate $=k\left[N{H}_3\right]$
• C. rate $=\frac{k[N{H}_3{]}^2}{\left[N_2\right][H_2{]}^3}$
• D. rate $=\frac{k[N{H}_3{]}^2}{\left[N_2\right]}$
• E. Cannot be determined from the information given

Answer 1

Answer: (E)

Cannot be determined from the information given

For the reaction, $N_2+3H_2\to 2N{H}_3$, the rate law expression cannon be determined as the reaction is a complex reaction which proceeds thorough several elementary steps. The rate law expression can only be written if the rate determining step (elementary step) is given.