1. The density of uranium, U, is 18.95 g/mL. What is the
volume, in mL, of 123 g of uranium?

2. A square piece of aluminum foil,
5.0 cm, along the edge, is found to weigh 0.1148 g. Given that the density of
aluminum is 2.70 g/cm^{3}, what is the thickness of this foil in angstrom.

3. 1.00 g of oxygen gas, O_{2} gas has a volume
of 670.2 mL. The same mass of carbon dioxide gas, CO_{2} occupies 505.8
mL. What are the densities of the two gases?