An irregularly-shaped sample of aluminum (Al) is put on a balance and found to have a mass of 65.5 g. The student decides to use the water-displacement method to find the volume. The initial volume reading is 50.6 mL and, after the Al sample is added, the water level has risen to 68.5 mL. a. Based on the problem above, write the known and the unknown quantities, respectively. b. What is the volume of aluminum (Al)?c. Find the density of the Al sample in g/cm3.