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A physician ordered magnesium sulfate 2 grams per hour for a maintenance dose. There are 40 grams of magnesium sulfate in 1 liter of lactated Ringers solution.
What is the rate per hour to administer the maintenance dose?

A.

10 mL/hr

B.

25 mL/hr

C.

50 mL/hr

D.

100 mL/hr

E.

100 mL/hr

Answer and Explanation

The Correct Answer is C

the correct rate to administer the maintenance dose is 50 mL/hr.

Step 1: Determine the concentration of magnesium sulfate in the solution.

  • There are 40 grams of magnesium sulfate in 1 liter of solution.
  • 1 liter = 1000 mL.

Step 2: Calculate the concentration in grams per mL.

  • 40 grams ÷ 1000 mL = 0.04 grams per mL.
  • Result: 0.04 grams per mL.

Step 3: Determine the required dose per hour.

  • The physician ordered 2 grams per hour.

Step 4: Calculate the volume of solution needed to provide 2 grams of magnesium sulfate.

  • Required dose (2 grams) ÷ concentration (0.04 grams per mL) = volume in mL.
  • 2 grams ÷ 0.04 grams per mL = 50 mL.
  • Result: 50 mL.
  • The calculated rate is 50 mL/hr.

the correct rate to administer the maintenance dose is 50 mL/hr.


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Related Questions

Correct Answer is D

Explanation

One tablespoon is equal to **14.7867648 milliliters**¹²³⁴. To convert tablespoons to milliliters, you can multiply the value in tablespoons by 14.7867648. For example, 1 tablespoon x 14.7867648 milliliters = 14.7867648 milliliters.

Therefore, to convert 1 tablespoon of mouthwash to milliliters, you can multiply 1 by 14.7867648. The answer is **14.7867648 milliliters**. This is the amount of mouthwash that a patient uses in 1 tablespoon.

Correct Answer is B

Explanation

To find the milliliters per dose, you need to use the formula for dosage calculation:

Volume (mL) = Dose ordered (mg) / Concentration (mg/mL) x Volume available (mL)

Since the dose ordered is 0.5 grams, the concentration is 125 mg/5 mL, and the volume available is 5 mL, plug in these values into the formula:

Volume (mL) = 0.5 grams / 125 mg/5 mL x 5 mL

However, before you can simplify and solve for the volume, you need to convert the dose from grams to milligrams by multiplying by 1000:

Volume (mL) = 500 mg / 125 mg/5 mL x 5 m

Simplify and solve for the volume:

Volume (mL) = 20 mL

Therefore, the nurse should administer **20 mL** of Amoxil per dose to the patient.

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