The answer is:
1.6 mL of liquid mercury
(Hg). (Density = 13.6 g/mL) = 21.76g of Hg
1 mole of Hg = 200.59 g
21.76 g Hg = 0.1084799 mole (= 21.76 g / (200.59 g/mole))
=
(6.02 * 10^23) * 0.1084799 = 6.53048998e22 number of atom in
1.6 ml of Hg (= 21.76 g of Hg)
