If 1 g of each of the following gases are takes at STP, which of the gases will occupy (a) greatest volume and (b) smallest volume ?
`Co, H_(2)O, CH_(4), NO`

Explanation

The molar mass of the gases are , `CO(28 g mol^(-1)) , H_(2)O (18 g mol^(-1)), CH_(4) (16 g mol^(-1))` and `NO (30 g mol^(-1))`. Since molar volume of all the gas `22.4 L` under S.T.P. conditions,1 gram of `CH_(4)` will occupy maximum volume while one gram of `NO` will occupy minimum volume.