# A certain volume of argon gas ( Mol.wt = 40) requires 45 s to diffuse through a hole at a certain pressure and temperature. The same volume of another gas of unknown molecular weight requires 60 s to pass through the same hole under same conditions?

##### 1 Answer

Sep 1, 2017

#### Answer:

71 g/ mol

#### Explanation:

since kinetic energy of every gases dipends only from the absolute temperature (Ek = KT) and then at a certain temerature is equal for every gasses, and kinetic energy is also given from

For that, the Graham's law says

but speed is proportional to the inverse of the time occurred to diffuse so