(1) A 1.5 m^3-volume tank holds oxygen gas (M = 32 g/mole) at the pressure of 500,000 Pa. The temperature is 27 C. Find the mass of oxygen in the tank (in kg).
(2) A ice chest is maintained at 0 C by ice placed in it. The chest has a total surface area of 600 cm2 and a thickness of
1 cm. The wall of the ice chest is of Styrofoam with thermal conductivity k = 2.3 *10^-4 cal/(cm s C). How much ice
will melt in the chest in 4 hours when the outside temperature is 20 C (in g)?