Density of a gas is found to be `5.46 g dm^-1` at `27^@C` and 2 bar pressure. What will be density at STP?

Explanation

d = PM/RT
For the same gas (i.e,, same M) at different temperatures and pressures, we can write `d_1/d_2 = P_1/T_1 xx T_2/P_2`
`d_1 = 5.46g dm^-3 , P_1` = 2 bar, `T_1` = 300K
At STP , `P_2` = 1 bar, `T_2` = 273
therefore `5.46/d_2 = 2xx273/300xx1`
` therefore d_2 = (300xx1xx5.46)/(2xx273) = 3g dm^-1`