Step-by-step explanation:
The recommended dose is 15 mg/kg body weight. To find the number of milliliters of the suspension to give to an infant weighing 19 lb, we need to convert the weight to kilograms and then calculate the number of milliliters based on the recommended dose.
1 lb = 0.453592 kg
19 lb = 19 * 0.453592 = 8.639 kg
So the recommended dose for an infant weighing 19 lb is 15 mg/kg * 8.639 kg = 129.085 mg
Now we know that the infant needs 129.085 mg of the acetaminophen suspension, and we know that the suspension contains 80 mg/0.80 mL.
To find the number of milliliters to give, we can use the proportion:
dose / concentration = volume
129.085 mg / 80 mg/mL = 1.613 mL
So the number of milliliters of the acetaminophen suspension that should be given to an infant weighing 19 lb is approximately 1.613 mL.