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Carry out the necessary calculations to determine the number of teaspoons that should be administered for a dosage of 50 mg if the drug is available in a concentration of 40 mg/2 mL.

A. 1 teaspoon
B. 2 teaspoons
C. 0.5 teaspoons
D. 1.5 teaspoons

Answer :

Sure! Let's go through the steps to solve this problem:

1. Understand the Concentration: The drug concentration is given as 40 mg for every 2 mL of solution. This means that each 2 mL contains 40 mg.

2. Find the Concentration per mL:
- Since 40 mg is in 2 mL, to find mg per mL, divide the total mg by the number of mL:
[tex]\[
\frac{40 \text{ mg}}{2 \text{ mL}} = 20 \text{ mg/mL}
\][/tex]

3. Determine the Volume Required for the Desired Dosage:
- We want to administer a dose of 50 mg. To find out how many mL are needed to get 50 mg, use the concentration we already calculated (20 mg/mL):
[tex]\[
\frac{50 \text{ mg}}{20 \text{ mg/mL}} = 2.5 \text{ mL}
\][/tex]

4. Convert mL to Teaspoons:
- Knowing that 1 teaspoon is equivalent to 5 mL, we can convert mL to teaspoons:
[tex]\[
\frac{2.5 \text{ mL}}{5 \text{ mL/teaspoon}} = 0.5 \text{ teaspoons}
\][/tex]

5. Conclusion:
- To administer a 50 mg dose of the drug, you would need 0.5 teaspoons. Therefore, the correct answer is:

C. 0.5 teaspoons

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