Density Problems Solve all density problems using the unit conversion method. Al final answers must have the correct units and the correct number of significant digits. What is the volume of a tank that can hold 20.475 kg of methanol whose density is 0.788g/cm2 1. 2. CaCl, is used as a de-icer on roads in the winter. It has a density of 2.50 g/cm'. What is the mass of 15.0 L this substance? 3. The density of paper is 1.20 g/cm'. What is the mass of the paper in a notebook that is 4.2 mm thick, 21.6 cm wide, and 27.9 cm long? The mass water in a salt water aquarium is 1.94 kg. The density of seawater is 1.03g/em'. What is the volume of the water the aquarium