Final answer:
The nurse will administer one whole Nafcillin 1 gm tablet per day, broken into two doses of half a tablet each to meet the 500 mg b.i.d. (twice daily) prescription.
Step-by-step explanation:
The student is asking how many Nafcillin 1 gm tablets a nurse should administer per day, considering the prescription specifies 500 mg taken twice daily (po b.i.d.). As the available tablets are 1 gram each and therefore contain 1000 mg, the nurse will need to administer half a tablet per dose to meet the 500 mg requirement. Since the medication is to be taken twice daily, the nurse will administer a total of one whole tablet per day (half in the morning, and half in the evening).