68. If 500 mg of a drug is used to prepare 80 mL of a syrup, how much of the drug in mg is contained in each teaspoonful dose?
Answer: C
Each teaspoonful dose contains 31.25 mg of the drug.
To find the amount of drug in each teaspoonful dose, we first need to determine the total number of doses in 80 mL, which is equivalent to approximately 16 teaspoons. Dividing the total drug amount of 500 mg by the number of doses gives us 31.25 mg per teaspoonful.
A) 6.25
This option is incorrect because 6.25 mg is significantly lower than the calculated amount per teaspoonful. If we were to derive this value, it would imply an incorrect total volume or dosage calculation.
B) 18.75
This option is also incorrect as 18.75 mg does not align with the calculation of total drug content per teaspoonful. This value may suggest a misunderstanding of the conversion from mL to teaspoons or the drug concentration.
C) 31.25
This is the correct answer, as it accurately reflects the amount of drug present in each teaspoonful dose. By calculating the total drug content of 500 mg divided by the total volume of syrup, we find that each teaspoonful (approximately 5 mL) contains 31.25 mg of the drug.
D) 93.75
This option is incorrect because 93.75 mg suggests an erroneous interpretation of the total drug content when divided by the number of doses. It is much higher than the actual calculated value for a teaspoonful dose.
Conclusion
The correct answer, 31.25 mg, is derived from accurately determining the concentration of drug per volume of syrup. All other options fail to represent the proper calculation based on the total drug amount and volume, leading to incorrect values for a teaspoonful dose.