The density of a gas A is three times that of a gas B. If the molecular mass of A is `60 g mol^(-1)` then the molecular mass of gas B is ……….`g mol^(-1)`

Answer

`20`

Explanation

`d=(PM)/(RT)`
`:.d prop M( :. P,T,R="constant")`
`:.(d_(1))/(d_(2))=(M_(1))/(M_(2)),(3d)/d=60/(M_(2)),60/3=20`
`gmol^(-1)`