Calculate the mass of each of the following: (a) a sphere of gold with a radius of 10.0 cm...

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