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Let's solve both parts based on the provided information.

### Part 1:
The brass alloy (yellow zinc) is between 34.0% and 37.0% zinc by mass, meaning the remaining percentage is copper.

- Zinc percentage range: 34.0% to 37.0%
- Copper percentage range: \( 100\% - 34.0\% = 66.0\% \) to \( 100\% - 37.0\% = 63.0\% \)

We are given that the total mass of the brass is **303 g**.

To find the **mass of copper**:
- Minimum copper mass = \( 66.0\% \) of 303 g
- Maximum copper mass = \( 63.0\% \) of 303 g

Let's calculate:

\[
\text{Min copper mass} = 0.66 \times 303 \, \text{g}
\]
\[
\text{Max copper mass} = 0.63 \times 303 \, \text{g}
\]

### Part 2:
We are asked to find the **mass range of zinc** in a sample that contains **47.3 g of copper**.

To solve:
- For **minimum zinc percentage** (34.0%), copper is 66.0%.
- For **maximum zinc percentage** (37.0%), copper is 63.0%.

Using these percentages, we need to compute the total mass of the sample, then find the zinc mass.

The total mass can be calculated using:
\[
\text{Total mass} = \frac{47.3 \, \text{g}}{\text{Copper percentage as decimal}}
\]

Then, calculate the zinc mass as:
\[
\text{Zinc mass} = \text{Total mass} - 47.3 \, \text{g}
\]

Let me compute both parts now.Here are the solutions for both parts:

### Part 1:
The mass range of copper in 303 g of yellow zinc brass is:
- **Minimum mass of copper**: 200.0 g
- **Maximum mass of copper**: 190.9 g

### Part 2:
The mass range of zinc in the sample that contains 47.3 g of copper is:
- **Minimum mass of zinc**: 24.4 g
- **Maximum mass of zinc**: 27.8 g

If you have any questions or want further details, feel free to ask!

Here are 5 related questions to expand your understanding:
1. How does the composition of different brass alloys affect their mechanical properties?
2. What role does zinc play in brass compared to copper?
3. How would the mass of zinc change if the copper content increased to 50 g?
4. Why is it important to maintain significant figures in scientific calculations?
5. How is brass used in electrical applications, and why is its composition important?

**Tip:** Always check the units and significant figures when performing calculations, especially in scientific contexts!

Find the mass range of copper and zinc in a sample of yellow zinc brass.

Learn how to calculate the mass range of copper and zinc in a sample of yellow zinc brass alloy with 34-37% zinc. This solution includes step-by-step calculations and relevant percentage formulas.

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