Identify (give the name and the structural formula) of an alkane that has a density of 4.558 g/L at 2 atm and 37 C.

Answer 1

The general gas law equation can be modified for density. It is
P*molar mass = density*R*T
Solve for molar mass. Knowing that the methyl group (CH3) is 15 and CH2 group is 14, you should be able to come up with a good possibility for the name of the alkane.

Answer 2

What is R and T stand for?