Question

At stp the density of a gas molecular wt. 45 in g/l is

Answer 1

One mole of any gas at STP will occupy a volume of 22.4 L (standard molar volume). The gas in question would have a molar mass of 45 g/mol. At STP, the molecular weight doesn't matter. The density will always be 1 mole / 22.4 L.