43. How much menthol is required to compound a formula reading: 'camphor 0.3%, menthol 0.25%, hydrocortisone 1%, Aquaphor q.s. ad 600 g'?
Answer: C
1500 mg of menthol is required to compound the formula.
To determine the amount of menthol needed, we calculate 0.25% of 600 g, which equals 1500 mg.
A) 15 mg
This option is incorrect as it significantly underestimates the required amount of menthol. Since 0.25% of 600 g is considerably higher than 15 mg, this choice does not meet the formulation requirements.
B) 150 mg
This choice is also incorrect. While it reflects a portion of the calculation, 150 mg is still too low because 0.25% of 600 g calculates to 1500 mg, making this option insufficient for the formula.
C) 1500 mg
This is the correct answer. By calculating 0.25% of 600 g, which results in 1500 mg, this option accurately reflects the quantity of menthol needed in the formulation.
D) 15 g
This option is incorrect as it overestimates the amount of menthol required. Converting 15 g to milligrams gives 15000 mg, which far exceeds the necessary quantity derived from the formula calculation.
Conclusion
The correct answer, 1500 mg, aligns perfectly with the requirement of 0.25% menthol in a total of 600 g of the compounded formula. All other options fail to either meet the percentage calculation or grossly miscalculate the amount needed, confirming that C is the only viable choice.