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To complete the table shown in the image, I'll guide you through the necessary steps for each compound. We need to compute the percentage composition of each element in the given compounds by following these steps:

1. **Identify the elements and their quantities** in the chemical formula.
2. **Calculate the molar mass** of each element based on its atomic mass (found on the periodic table).
3. **Determine the total molar mass** of the compound.
4. **Find the mass contribution of each element**.
5. **Calculate the percentage composition** using the formula:

   \[
   \text{Percentage Composition of Element X} = \left(\frac{\text{Total mass of Element X in the compound}}{\text{Total molar mass of the compound}}\right) \times 100
   \]

I'll start with one of the compounds as an example.

### Example 1: Sodium Chloride (NaCl)
1. **Formula**: NaCl
2. **Elements Present**: Sodium (Na), Chlorine (Cl)
3. **Number of Atoms Present**:
   - Na = 1
   - Cl = 1
4. **Molar Masses**:
   - Sodium (Na) = 22.99 g/mol
   - Chlorine (Cl) = 35.45 g/mol
5. **Total Molar Mass**:
   \[
   22.99 + 35.45 = 58.44 \, \text{g/mol}
   \]
6. **Mass of Each Element**:
   - Na: \( 22.99 \, \text{g/mol} \)
   - Cl: \( 35.45 \, \text{g/mol} \)
7. **Percentage Composition**:
   - Na: \( \frac{22.99}{58.44} \times 100 = 39.34\% \)
   - Cl: \( \frac{35.45}{58.44} \times 100 = 60.66\% \)

We can proceed similarly for the other compounds (PbS, (NH₄)₃PO₄, AlCl₃, and C₉H₈O₄). Would you like me to go step by step through all of them?

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Relative questions:
1. How is the molar mass of a compound calculated?
2. Why is it important to know the percentage composition of a compound?
3. How do you find the atomic mass of elements?
4. What role does Avogadro's number play in molar mass calculations?
5. Can a compound's percentage composition change under different conditions?

**Tip**: To ensure accuracy, always use the most up-to-date atomic masses from a reliable periodic table for these calculations.

Complete the table by computing the percentage composition of the following compounds: NaCl, PbS, (NH4)3PO4, AlCl3, C9H8O4.

Step-by-step guide to calculating the percentage composition of NaCl, PbS, (NH4)3PO4, AlCl3, and C9H8O4. Learn how to determine molecular mass and use it to find the percentage composition of each element in these compounds. Suitable for high school chemistry students (Grades 9-12).

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