Your answer: 450mL will be administered
150 kg, and 3mEq for each kg every hour. We can ignore the hour part, since it’s only 1 hour they’re looking for.
3mEq for each kg means 3 x 150 = 450 mEq total.
Since the concentration is 1mEq/1mL, we need 450mL.
Does that all make sense? Let me know if you have any questions.