Question

Ammonia can be synthesized from nitrogen and hydrogen according to the following balanced chemical equation:
N₂(g) + 3H₂(g) → 2NH₃(g)

At a particular instant, NH₃ is being produced at a rate of 0.50 M/min. What is the correct expression for the reaction rate?

0.25 M/min

0.50 M/min

1.0 M/min

1.5 M/min

0.33 M/min

Answer 1

Given rate of production of NH_{​​​​​3}​​​​ is 0.50M/min.

From the equation

N_{​​​​​​2} + 3H₂ ---> 2NH₃

Rate = - d[N_{​​​​​​2}]/dt = -1/3 d[H_{​​​​​​2}] /dt= 1/2 d[NH_{​​​​3}] /dt

Now 1/2 d[NH_{​​​​​3}​​​​]/dt =0.50M/min

so d[NH_{​​​​​3}​​​​]/dt = 2*0.50M/min

=1.0 M/min (Ans)