Question

The rate of a gaseous reaction becomes half when volume of the vessel is doubled. What is the order of reaction ?

Answer 1

Suppose, order of reaction is n and the reaction is A (g) => Products
Rate = k[A]ⁿ                                         ...(i)
When volume is doubled, molar conc. becomes half and rate of reaction gets halved.

                  ......(ii)

Dividing equation (i) by equation (ii),
                       (2)¹ = (2⁾ⁿ
                           Or n = 1