Discussion Forum



1)

Average rate of reaction for the following  reaction  $2SO_{2}(g)+O_{2}(g)\rightarrow 2SO_{3}(g)$   is written as


A) $\frac{\triangle[SO_{2}]}{\triangle t}$

B) $-\frac{\triangle[O_{2}]}{\triangle t}$

C) $\frac{1}{2}\frac{\triangle[SO_{2}]}{\triangle t}$

D) $\frac{\triangle[SO_{3}]}{\triangle t}$

Answer:

Option B

Explanation:

The average rate of reaction is defined as the speed with which the reactants are converted  into products

For reaction, 

   $2SO_{2}(g)+O_{2}(g)\rightarrow 2SO_{3}(g)$

$-\frac{1}{2}\frac{\triangle[SO_{2}]}{\triangle t}=\frac{-\triangle[O_{2}]}{\triangle t}=+\frac{1}{2}\frac{\triangle[SO_{3}]}{\triangle t}$

 So, average rate of reaction  is written as  $-\frac{\triangle[O_{2}]}{\triangle t}$