Determine the number of moles of O2(g) needed to completely react with 2.0 moles of C6H10O5(g). (Use the balanced equation in the image with information to help you answer)

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.

The mass has escaped into a gas which you can not see so the law stays true.