Final answer:
To administer 500 mg of Chloromycetin every 6 hours, the nurse would give 2 capsules.
Step-by-step explanation:
To determine the number of capsules that the nurse would need to administer, we first need to calculate the dosage that each capsule contains. Since each capsule is 250 mg and the order is for 500 mg, the nurse would administer 2 capsules per dose.