5.00 mF, 10.0 mF, and 50.0 mF capacitors are connected in series across a 12.0-V battery. What is the potential difference across the 10.0-mF capacitor?

Kirchhoff's junction rule: At any junction point, the sum of all the currents entering the junction must equal the sum of all the currents leaving the junction.
Kirchhoff's loop rule: The sum of the changes in potential around any closed path of a circuit must be zero.