Calculate the density of C2H2 gas (FM = 26.04 g/mol), in g/L, at a pressure of 2.082 atm and at a temperature of 62.5oC.

Answer 1

The general gas law of PV = nRT can be modified to P*molar mass = density*RT.

You can also work it the long way.
PV = nRT and solve for n to find mols. Use 1L for volume.
Then n = grams/molar mass. You know n and molar mass, solve for grams and that will be g/L since you used 1 L for the volume to fine v.