When 250 mg of a medication is diluted in 500 mL of 5% dextrose in water, how many milligrams of the medication will be in 1 mL of D5W?
0.5.
50.
500.
5.
The Correct Answer is D
The question asks how many milligrams of the medication will be in 1 mL of D5W. To find this, we need to know the concentration of the medication in the solution.
Concentration is the amount of medication per unit volume of solution. We can use this formula:
Concentration = Mass / Volume
We know that 250 mg of the medication is diluted in 500 mL of D5W. So we can plug these values into the formula:
Concentration = 250 mg / 500 mL Simplifying, we get:
Concentration = 0.5 mg / mL
This means that there are 0.5 mg of the medication in every 1 mL of D5W. So the answer is
- To check our answer, we can use another formula:
Mass = Concentration x Volume
If we want to find the mass of the medication in 1 mL of D5W, we can multiply the concentration by the volume:
Mass = 0.5 mg / mL x 1 mL Simplifying, we get:
Mass = 0.5 mg
This matches our answer.
The other choices are wrong because they do not use the correct formula or values. Here is why:
Choice A is wrong because it uses the inverse of the concentration (1 / 0.5) instead of the concentration (0.5).
Choice B is wrong because it uses the mass of the medication (250 mg) instead of the concentration (0.5 mg / mL).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A client with expiratory wheezing after an albuterol treatment.
This indicates that the client has a severe bronchospasm that is not responding to the medication and may lead to respiratory failure.
The client needs immediate intervention to improve airway patency and oxygenation.
Choice A is wrong because a fasting blood sugar of 187 mg/dL is high but not life- threatening. The normal range for fasting blood sugar is less than 99 mg/dL.
The client may have diabetes or prediabetes and needs further evaluation and treatment, but this is not a priority over choice B.
Choice C is wrong because a client who has been called to surgery 2 hours early may need some preparation and education, but this is not an urgent situation.
The client can wait until the nurse has assessed the other clients.
Choice D is wrong because a blood pressure of 178/90 mmHg is elevated but not critical. The normal range for blood pressure is less than 120/80 mmHg.
The client needs a dose of atenolol, which is a beta
Correct Answer is B
Explanation
120/77 mmHg. This is because this blood pressure reading is within the normal range of less than 120/80 mmHg. Hypertension is defined as a blood pressure of 140/90 mmHg or higher.
Choice A is wrong because 84/50 mmHg is too low and may indicate hypotension, which can cause dizziness, fainting, or shock.
Choice C is wrong because 148/88 mmHg is above the normal range and indicates prehypertension, which is a risk factor for developing hypertension and cardiovascular disease.
Choice D is wrong because 160/90 mmHg is above the normal range and indicates stage 1 hypertension, which requires treatment with lifestyle changes and medication.
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