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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

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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

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