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The question asks how many grams of zinc oxide powder are needed to prepare a 30-gram order of zinc oxide 5% ointment.

Here’s how to solve it:

1. **Total ointment mass:** 30 grams.
2. **Percentage of zinc oxide in the ointment:** 5%.

To calculate how much zinc oxide is required:

\[
\text{Zinc oxide amount} = \text{Total mass} \times \frac{\text{Zinc oxide percentage}}{100}
\]
\[
\text{Zinc oxide amount} = 30 \, \text{g} \times \frac{5}{100} = 1.5 \, \text{g}
\]

So, **1.5 grams** of zinc oxide powder are needed.

The correct answer is **B. 1.5 g**.

Would you like further clarification or details?

### Related Questions:
1. How do you calculate the amount of base required in a 5% ointment?
2. What is the role of zinc oxide in medical ointments?
3. How do you prepare ointments with different percentage concentrations?
4. How do you calculate the percentage of an ingredient in a compound?
5. How can you adjust the formula if more or less ointment is needed?

### Tip:
When calculating percentages in compounding, always confirm the total mass and the percentage to ensure proper dosing.

An order is received for 30 grams of zinc oxide 5% ointment. The master formulation record states zinc oxide powder, USP and White petrolatum, USP are the two ingredients to be used to compound the ordered preparation. How many grams of zinc oxide powder are needed to prepare this order?

Learn how to calculate the amount of zinc oxide required for a 30g 5% ointment. This problem covers percentage calculation and basic pharmacy compounding techniques. Ideal for students in Grades 9-12 and those studying basic pharmaceutical compounding.

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