Question

The density of certain gas is 1.43 gm at 608 torque find the molecular mass of the gas

Answer 1

Answer:

Density of a gas at STP is 1.43 grams per Litre

The density of a substance is supposed to tell you the mass you have per unit of volume of that substance, not per mole like you have there. So instead of 1.43 g/mol , you should have 1.43 g/L , i.e. 1 L of this gas has a mass of 1.43 g at STP conditions.