A molar volume of gas has a density of 1.7824*g*L^-1 at "STP". What is the molecular mass of this gas?

2 Answers
Jul 7, 2017

Well the molar volume of an Ideal Gas at STP is 22.4*L

Explanation:

We assume Ideal Gas behaviour..........

And thus, at STP, we have gots a molar mass of........

22.414*L*mol^-1xx1.7824*g*L^-1=39.95*g*mol^-1......

You should be able to identify this gas "pdq".

Jul 7, 2017

we know , 22.4 L of any gas gas at STP is 1 mol of the gas.

We have been given that the density of an elemental gas is 1.7824g/L at STP.

Hence mass of 22.4 L of the elemental gas gas at STP is its molar mass.
Hence molar mass =22.4L/"mol"xx1.7824g/L~~39.9258g"/"mol