Question

Rate of formation of SO₃ in the following reaction 2SO₂ + O₂ → 2SO₃ is 100 g min^–1. Hence rate of disappearance of O₂ is :

(A) 50 gmin^-1 

(B) 40 gmin^–1

(C) 200 gmin^–1 

(D) 20 gmin^–1

Answer 1

The correct answer is  D) 20 g/min 

Solution ::
\({d\over dt} [SO_3]=100 g/min\) 

\(={100\over80}mole/min =1.25 mole/min\) 

\({-1\over2}{d\over dt}[SO_2]\) 

\([SO_3]={-d\over dt}[O_2]={1\over2}{d\over dt}\) 

\(={1.25\over2}\times 32mole/min \) 

=20 g/min