Final answer:
The nurse should administer 170 mL/hr of fluid using the Parkland formula for fluid replacement in a burn patient.
Step-by-step explanation:
The Parkland (Baxter) formula is used for fluid replacement in burn patients. The formula is TBSA burned x Wt(kg) x 4 mL.
In this case, the patient's TBSA is 50% and their weight is 68 kg. So, the calculation would be: 50% x 68 kg x 4 mL = 1360 mL.
The fluid should be administered in the first 8 hours, so we need to divide the total volume by 8: 1360 mL / 8 hours = 170 mL/hr.