The density of an ideal gas is `1.25xx10^(-3)g cm^(-3)` at STP. Calculate the molecular weight of the gas.

Explanation

From the formula
` PV= (nRT) = (m/M)RT ……..(1)`
where
m= mass of the gas
M= molecular weight of the gas
From equation (1),
` P=(m/M) ((RT)/V)= ((dRT)/M)`
` :. M= (dRT/P)= ((1.25 xx 10^3 xx 8.3 xx 273)/10^5)`
`= 28.3 g/mol`