Find out the relative rates of diffusion of methane and sulphur dioxide under similar conditions of temperature and pressure.

The relative rates of diffusion of substances are

The molecular weights of oxygen and sulphur dioxide are 32 and 64 respectively. If 1 litre of oxygen are 32 and 64 respectively. If 1 litre of oxygen at 15^(@)C and 740 mm pressure contains N molecules, the number of molecules in 2 litre of sulphur dioxide under the same conditions of temperature and pressure will be

The ratio of the rate of diffusion of helium and methane under indentical conditions of pressure and temperature will be