The rate of formation of ammonia by the reaction : N2 + 3 H2 ⟶ 2 NH3 is expressed as d[NH ] dt = 2.5 × 10–4 mol L–1 s–1 . The rate of consumption of H2 expressed as d[H ] dt will be

Rate of Rxn = 3 2 2 1 1 3 2 d NH d N d H dt dt dt So, Rate of Rxn 7 4 1 1 1 2.5 10 1.25 10 molL 2 s x x x So, 2 3 d H dt x Rate of Rxn = 3 [ ] 3 2 d NH dt 4 1 1 3.75 10 x mol L s i.e., 3times rate of reaction and 1.5 times of that expressed in terms of 3 NH