Because the charges on the electron and proton have the same absolute value, atoms are electrically neutral. Suppose this were not exactly true, and the absolute charge of the electron were less than the charge of the proton by (1.50e-5)e. now its a 4 part question, i think i can do the other 3, but i don't understand the first part. 1) What would be the net charge in 1.50 liters of water? (Take the density of water to be 1 g/cm3 and the molecular weight of water to be 18.) so i solve for the number of moles, and then the number of molecules. and i get 55.55 moles or 3.35x10^25. from there i'm just not sure what i should do. My first thought is to solve for how many protons/electrons in each molecule. I don't happen to have the periodic table handy, but i'm sure i could find it online. But usually he gives us all that sort of info, so i was sorta doubting thats what i had to do. I was thinking maybe there was some easier way. Any ideas?