Doubt from chemical equilibrium



2)
And in this 2nd question, in the solution given in the book, for the equilibrium equation they have considered moles of the products and reactants but here the volume is not getting canceled so we should consider concentration right??
I think the solution given is wrong so just wanted to confirm…

@Seshank
@manan_uppadhyay

Bro i’m not getting the first question.

But to answer you rsecond question, Cl2 is given as thrice of Br2. Hence we do not have to consider volumes. In the sense that we have already factored in volume by multiplying 3 to the no.of moles of bromine.

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For the 1st question can you ask your sir how to solve it??