How many mercury atoms are there in 3.8 mol of mercury? show work

There are 6.02x10^22 molecules of any atom/molecule in one mole of anything.

Therefore no. of atoms in 3.8 mols of Mercury= 3.8 * 6.02x10^22=  2.2876x10^23 atoms

C) electrons encircling a nucleus with neutrons and protons

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water