Question

give the correct answer plz..quest no.21

Answer 1

It is the concept of States of matter,

rate is indirectly proportional to the molecular mass of substance,

let r1 be the rate of first gas and r2 be the rate of second gas.

r1/r2=(m2/28)^2

x/0.5x=(m2/28)^2

squaring on both sides,

1/0.25=m2/28

m2=28/0.25

m2=112

the molecular mass of the gas is 112g.