Problem solving: Solve the following and show your complete solution.
1. Calculate the density in g/mL of 0.4L of solution weighing 150 grams.

2. What is the density of a rock that has a volume of 12.0mL and a mass of 67.5 grams.

3. A student places a sample of pure liquid in a flask with a capacity of 20.0mL. The dry flask has amass of 31.5 grams and the filled flask has a mass of 55.8 grams. What is the density of the liquid?

4. Calculate the density of a wooden block measuring 15.24 cm x 12 cm x 5.1 cm and weighing 3.25 kilograms. Calculate the density of the wooden block in grams per cubic centimeter, g/cm3.