Determine the number of molecules of XeF4, in an 538 g sample of XeF4. Express your answer in scientific notation using the format (for example) 6.022*10^23 for 6.022x1023.

To determine the number of molecules of XeF₄ in a 538 g sample, follow these steps:

### Step 1: Calculate the molar mass of XeF₄.
- Xenon (Xe) has an atomic mass of approximately 131.29 g/mol.
- Fluorine (F) has an atomic mass of approximately 18.998 g/mol.

So, the molar mass of XeF₄ is:
\[
\text{Molar mass of XeF₄} = 131.29 \, \text{g/mol} + 4 \times 18.998 \, \text{g/mol} 
= 131.29 \, \text{g/mol} + 75.992 \, \text{g/mol} = 207.282 \, \text{g/mol}.
\]

### Step 2: Determine the number of moles of XeF₄ in 538 g.
\[
\text{Moles of XeF₄} = \frac{\text{mass of sample}}{\text{molar mass of XeF₄}} = \frac{538 \, \text{g}}{207.282 \, \text{g/mol}} \approx 2.595 \, \text{mol}.
\]

### Step 3: Use Avogadro's number to calculate the number of molecules.
Avogadro's number is \(6.022 \times 10^{23}\) molecules per mole. Therefore, the number of molecules in 2.595 moles is:
\[
\text{Number of molecules} = 2.595 \, \text{mol} \times 6.022 \times 10^{23} \, \text{molecules/mol} \approx 1.562 \times 10^{24} \, \text{molecules}.
\]

### Final Answer:
The number of molecules of XeF₄ in a 538 g sample is approximately:
\[
1.562 \times 10^{24} \, \text{molecules}.
\]

Would you like more details or have any questions?

### Related Questions:
1. How is the molar mass of a compound determined?
2. What is Avogadro's number, and how is it used in chemistry?
3. How do you convert grams to moles in a chemical calculation?
4. What is the significance of scientific notation in chemistry?
5. How does the molecular structure of XeF₄ influence its properties?

### Tip:
Always ensure your units are consistent when performing mole calculations—grams should correspond to the molar mass in grams per mole.

Determine the number of molecules of XeF4, in a 538 g sample of XeF4. Express your answer in scientific notation using the format (for example) 6.022*10^23 for 6.022x10^23.

Find out how to calculate the number of molecules in a 538 g sample of XeF4 using the molar mass, Avogadro's number, and scientific notation. Learn stoichiometric concepts and solve chemistry problems step by step. Suitable for high school chemistry students in Grades 10-12.

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