How many molecules of water are there in 0.80 mol of water?

4.816 x 10^23, because the number of atoms in one mole of any compound, mixture, or pure substance is 6.02 x 10^23, and multiplying that by 0.8 moles you get that there are 4.816 x 10^23 atoms in 0.8 moles of water.

beta decay is the answer

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.