The chart above will help you decide as to which conversion you should start from and end up with.
examples of density conversions:
Liquid Nitrogen has a density of 1.2506 g/mL. Find the volume of Nitrogen occupied by 1.3 x 10^27 atoms of N^2
In this problem, we have to know what we start with(the bold words). Then we have to determine what unit we need by the end of the problem (italicized words).
Looking at the problem, we know that we start off with : 1.2506 g/mL. We need to end up with L in the end. In order to solve this problem, we can locate the steps we need by referring back to the picture above. We need to go from molecules to moles to molar mass to density.
1.3 x 10^27 x 1 mol/ 6.02 x 10^23 x 14g/1 mol=30.23 g
VOLUME= 30.23 g/1.3 g per mL= 39.3 mL--->0.39 g/L