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**[SOLVED] Coulomb's Law**

## Homework Statement

Find the magnitude of the attractive force exerted by the electrons in a cup of water on the protons in the second cup of water at a distance of 10 m. Assume that each cup contains 250g of water and that 6x10^23 water molecules (one mole) weighs 18 g. Do two cups of water exert any net force on each other? Why?

## Homework Equations

F = k*(qq/r^2)

## The Attempt at a Solution

250g H2O / 18g H2O * 6.022^23 = 8.36^24 molecules of water

I don't understand how to proceed after that. Do I need to find the number of electrons/protons in all H and O atoms separately and add them? Then multiply by 1.602^-19C (electron/proton charge) and plug those numbers into the formula?