A nurse is preparing to administer penicillinG benzathine 200,000 units IM to a school-age child. Available is penicillinG benzathine injection 600,000 units/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Given: Desired dose: Penicillin G benzathine 200,000 units IM Available concentration: Penicillin G benzathine injection 600,000 units/mL To find: Volume to administer (in mL) Step 1: Set up the proportion We can use the following proportion to solve the problem: (Desired dose) / (Available concentration) = Volume to administer Step 2: Substitute the values Plugging in the given values, we get: (200,000 units) / (600,000 units/mL) = Volume to administer Step 3: Simplify To simplify, we can invert the denominator and multiply: (200,000 units) * (1 mL / 600,000 units) = Volume to administer The "units" cancel out, leaving us with: (200,000 * 1 mL) / 600,000 = Volume to administer Step 4: Calculate Performing the multiplication and division, we get: 200,000 mL / 600,000 = Volume to administer 0.33 mL = Volume to administer Step 5: Round to the nearest whole number Since the question asks for the volume rounded to the nearest whole number, we round 0.3.