1) The ratio of the rates of diffusion of two gases x and sulphur (IV) oxide (SO₂) is 2:3 respectively, calculate the molecular mass of gas x given that (S=32.0,O=16.0)
Solution
Step III
Subtitute the rates and the molecular mass    2⁄3
=    √64
       x

Step IV
Remove the root by squaring both sides.
(2⁄3)² =    √64
             x
2⁄3    =    64⁄x