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
“I apologize for not hearing you say that. Is there a better day for you?”.
This response shows empathy and respect for the client’s feelings and preferences.
It also invites the client to collaborate on finding a solution that works for both parties. Choice A is wrong because it is rude and defensive.
It does not acknowledge the client’s frustration or offer any alternatives. Choice C is wrong because it is dismissive and paternalistic.
It does not respect the client’s autonomy or consider the client’s reasons for not being able to come back on Friday.
Choice D is wrong because it is persuasive and manipulative.
It does not address the client’s concerns or explore other options.
The nurse-client relationship is based on trust, respect, and collaboration.
The nurse should use therapeutic communication skills to maintain a positive rapport with the client and promote their health and well-being.
Correct Answer is A
Explanation
Using an automatic BP cuff with a shivering client with a history of an irregular heart rate can result in inaccurate and low readings.
This is because shivering can interfere with the cuff inflation and deflation, and an irregular heart rate can affect the accuracy of the device.
The nurse should intervene and use a manual BP cuff with a stethoscope instead.
Choice B is wrong because pulling the client’s ear pinna backward, up and out to obtain a tympanic membrane temperature is the correct technique for adults and older children. This helps to straighten the ear canal and allow the light to reflect on the tympanic membrane, which shares the same vascular artery as the hypothalamus.
Choice C is wrong because counting the client’s radial pulse who is supine with the forearm straight alongside the body is an appropriate method.
The radial pulse can be easily palpated at the wrist, and the supine position and straight forearm do not affect the pulse rate.
Choice D is wrong because counting the respirations for one full minute for a client with tachypnea is a recommended practice.
Tachypnea means rapid breathing, and counting for one full minute can ensure accuracy and detect any variations in the respiratory pattern.
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