Chemistry
posted by Mary .
Lithium is a soft, gray; solid that has the lowest density of any metal. If a rectangular slab of lithium weighs 1.49x10^3 mg and has a volume of 2.76 cm^3, what is the density of lithium in g/cm^3? Please and thank you!

mass = volume x density.
You know mass from the problem (you should convert to grams) and you know volume. Solve for density.