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This is Giancoli Answers with Mr. Dychko. The charge in a capacitor is equal to its capacitance times the voltage and we can solve for voltage by dividing both sides by C and so the V is going to be the charge in each plate divided by the capacitance. So 16.5 times ten to the minus eight coulombs divided by 8500 picofarads and Pico is ten to the minus 12 and that gives us about 19 volts.