If two molecules of A and B have mass 100 kg and 64 kg and rate of diffusion of A is 12 × 10-3, then what will be the rate of diffusion of B? (BCECE 2008)

According to Grahm’s law, / / A B B A r r M M Here, 100 / , 2 A M kg molecule 64 / 2 B M kg molecule 3 12 10 Ar x and rB = ? 3 12 10 64 / 2 64 8 100 / 2 100 10 Br x 3 3 12 10 10 15 10 8 Br x x x