Solve this: Q In a vessel containing SO3, SO2 and O2 at equilibrium, some helium gas is introduced so - Chemistry - Chemistry in Everyday Life

Question

Solve this:
Q In a vessel containing S O 3 ,   S O 2   a n d   O
2 at equilibrium, some helium gas is introduced so that the total
pressure increases while temperature and volume remain constant
According to Le-Chatelier principle, the dissociation of S O 3
(1) Increases
(2) Decreases
(3) Remains unaltered
(4) None of these

Vartika Jain · Accepted Answer

Dear Student,

SO2 + 12O2  ↔ SO3The increase in pressure favours the side where less number of moles of gas are present
 Here, lesser moles are presen tin the forward reaction
 Therefore, by increasing pressure reaction will move forward
 Hence, dissociation of SO3 will decrease and formation of SO3 will increase
 So, correct answer is (2)