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
Select a 0.5 mL syringe, 30 gauge, 8 mm needle and inject at a 90-degree angle. This is because Humulin R is a clear and colorless solution that can be given by subcutaneous injection.
A 0.5 mL syringe can hold up to 50 units of insulin, which is enough for the prescribed dose of 7 units. A 30 gauge, 8 mm needle is suitable for thin patients with poor skin turgor. Injecting at a 90-degree angle ensures that the insulin reaches the subcutaneous tissue and not the muscle.
Choice A is wrong because a 31 gauge, 6 mm needle is too short and may not deliver the insulin into the subcutaneous tissue.
Choice C is wrong because pinching the skin is not necessary for thin patients with poor skin turgor.
Choice D is wrong because a 1.0 mL syringe is too large for the prescribed dose of 7 units and may cause dosing errors. A 28 gauge, 12.7 mm needle is too long and may inject the insulin into the muscle, which can affect its absorption and action.
Correct Answer is B
Explanation
This is because acute pain is the most urgent and life-threatening problem for a client with myocardial infarction.
Acute pain indicates ongoing ischemia and tissue damage, which can lead to complications such as heart failure, arrhythmias, or cardiogenic shock. Therefore, relieving pain is the priority nursing diagnosis.
Choice A. Anxiety is wrong because anxiety is not a specific symptom of myocardial infarction and anxiety is due to the discomfort that happens due to activation of the sympathetic pathway which is good for survival.
Choice C. Knowledge deficit is wrong because knowledge deficit is not an immediate problem for a client with myocardial infarction.
Knowledge deficit can be addressed after the acute phase of the condition is over and the client is stable.
Choice D. Nausea and vomiting are wrong because nausea and vomiting are common symptoms of myocardial infarction, but they are not as urgent and life-threatening as acute pain.
Nausea and vomiting can be treated with antiemetics and fluids, but they do not affect the outcome of the condition as much as pain does.
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