Question

the ratio of rates of diffusion of two gases A and B under same pressure is1:4 if ratio of masses in mixture is 2:3 what is mole fraction
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Answer 1

ratio of diffusion is 1;4 ,it means ratio of molecular masses is 16:1

then

moles of A= 2/16 = 0.125

moles of B= 3/1= 3

mole fraction of A=0.125/(3+0.125)

= 0.04

mole fraction of B= 3/3.125

= 0.96

as sum of mole fraction is always equal to 1;