The density of acetone is 0.788 g/mL. What is the volume in mL of a 48 mg sample of acetone?
3.8 x 104 mL
6.1 x 104 mL
6.1 x 10-2 mL
3.8 x 10-2 mL
1.6 x 101 mL
mass = volume x density
You know mass and you know density, substitute and solve for volume in mL.