Under certain conditions argon gas diffuser at a rate of 3.2 cm/s under the same conditions as unknown gas to visit a rate of 4.5 cm/s what is the approximate molar mass of the unknown gas

10 g/mol

20g/mol

28 g/mol

56 g/mol

answer: c) 28 g/mol

Explanation: Rate of diffusion : It is defined as the volume of gas effused in a given time 't'.

Formula used:

According to Graham's law of diffusion, rate of diffusion is inversely proportional to the square root of the mass of the gas.

where,

= rate of diffusion of argon gas = 3.2cm/sec

= rate of diffusion of unknown gas = 4.5 cm/sec

= Molar mass of argon gas = 40g/mol

= Molar mass of unknown gas