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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?