Electrostatic Potential Energy

Hi, I am trying to study for my second physics exam. Any help with this problem is appreciated:
Calculate the electrostatic potential energy stored in the H2O molecule
when
Positive charge of +.335e on each H atom and negative charge of -.670e on the O atom.
The answer is -9.3e-19
Could someone explain how to calculate this??

What is "e"? elementary charge? whats the unit of .335e coloumbs? nanocoloumbs?

Electric potential energy = Kq1q2/r

you dont have r from what i see, but thats the formula. Plug in your values your question is missing something or i have lost my physics touch.

So I get
(9e9) * .335(e?) * -.670(e?) / .942 A
what do I plug in in the calculator?
My physics lecture is purely conceptual, no calculations are shown.

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