An empty beaker weighs 40.87 g. a) When completely filled with water, the beaker and its contents have a total mass of 289.85 g. What volume does the beaker hold? Use ? =1.00 g/mL as the density of water. b) How much would the beaker and its contents weigh if it was completely filled with mercury? The density of mercury is ? =13.5 g/mL