Question

if the O2 is reacting at the rate of 0.25 Ms-1,

calculate:

i. rate of NO2

Answer 1

Consider,

2NO(g)+O2(g)→2NO2(g)

Moreover, understand that reaction rates are proportional to the stoichiometry of the reaction. Hence,

$\frac{0.070M}{S} \times \frac{2NO_2}{2NO}=\frac{0.070M}{S}$

is the rate of appearance of nitrogen dioxide, and

$(0.070\frac{M}{s})\times \frac{0_2}{2NO}=\frac{-0.035 M}{s}$

is the rate of disappearance of the oxygen.

To be sure, reaction rates are merely,

$\frac{\bigtriangleup[A]}{\bigtriangleup t}$

and the concentrations of the constituents are proportional to the stoichiometry.