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How much white petrolatum (in grams) should be mixed with 250 g of 5% and 750 g of 15% sulfur ointments to prepare a 10% ointment?
Accepted Answer
Here's how to calculate the amount of white petrolatum needed:
1. Calculate the total sulfur in the mixture:
250 g of 5% ointment contains (250 g
0.05) = 12.5 g of sulfur.
750 g of 15% ointment contains (750 g
0.15) = 112.5 g of sulfur.
Total sulfur = 12.5 g + 112.5 g = 125 g
2. Determine the total weight of the final 10% ointment:
Since the final ointment is 10% sulfur, and it contains 125 g of sulfur, the total weight is (125 g / 0.10) = 1250 g.
3. Calculate the amount of white petrolatum needed:
Total weight of the ointment - weight of sulfur = weight of white petrolatum.
1250 g - 125 g = 1125 g
Therefore, you should mix 1125 g of white petrolatum with the existing ointments to prepare a 10% sulfur ointment.
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