Calculate the mass of each of the following:
(a) A sphere of gold with a radius of 10.0 cm [the volume of a sphere with a radius r is V = (4y3)πr3; the density of gold = 19.3 g/cm3],
(b) A cube of platinum of edge length 0.040 mm (the density of platinum = 21.4 g/cm3),
(c) 50.0 mL of ethanol (the density of ethanol 5 0.798 g/mL).