Final answer:
The total charge on a series combination of five capacitors, each with a charge of 6 microcoulombs, is 6 microcoulombs.
Step-by-step explanation:
In a series combination of capacitors, the charge on each capacitor is the same. If there are five capacitors connected in series and each one has a charge of 6 microcoulombs, then the total charge on the combination is still 6 microcoulombs.
This is because in a series circuit, charge conservation implies that the same amount of charge must move through every component of the circuit, so all capacitors must have the same charge.