A patient is prescribed 4.0 oz of a steroid ointment. How many grams of ointment does the pharmacist need to prepare? (Note there are 16 oz in 1 lb.)

To convert the prescribed amount of ointment from ounces (oz) to grams (g), we'll follow these steps:

### Step 1: Convert ounces to pounds
Given that there are 16 ounces in 1 pound:

\[
\text{Weight in pounds} = \frac{4.0 \, \text{oz}}{16 \, \text{oz/lb}} = 0.25 \, \text{lb}
\]

### Step 2: Convert pounds to grams
We know that 1 pound is approximately 453.592 grams:

\[
\text{Weight in grams} = 0.25 \, \text{lb} \times 453.592 \, \text{g/lb} = 113.398 \, \text{g}
\]

### Step 3: Determine the correct number of significant figures
- The given value (4.0 oz) has **2 significant figures**.
- Therefore, the final answer should also be given with **2 significant figures**.

### Final Answer:
\[
\text{The pharmacist needs to prepare } 1.1 \times 10^2 \text{ g of ointment.}
\]

Would you like further details or have any questions?

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Here are 5 related questions for you:
1. How do you convert units from the imperial system to the metric system?
2. What is the significance of significant figures in unit conversion problems?
3. How would the calculation change if the patient were prescribed a different amount?
4. Can you explain why 1 pound equals 453.592 grams?
5. What other common conversions might a pharmacist need to perform?

**Tip:** When converting between units, always check that your final answer has the correct number of significant figures to reflect the precision of the initial measurements.

Learn how to convert 4.0 ounces of steroid ointment to grams using unit conversion. Follow a step-by-step solution involving conversion factors and understand the significance of significant figures in unit conversions.

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