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I can see the image of a chemistry quiz you uploaded. I will extract and address each of the questions listed on it.

Here are the questions:

1. **Which of the following elements belongs to the noble gas series?**
   a. Sodium  
   b. Neon  
   c. Bromine  
   d. Magnesium  

2. **The products of the complete combustion of octane, C8H18, are carbon dioxide and water. Write a balanced equation for this reaction:**
   - Choices are four different balanced reactions.

3. **Which species in the reaction is the reducing agent?**
   a. H2O  
   b. CO  
   c. HgO  

4. **Copper has an atomic weight of 63.55 u. If 69.17% of copper exists as \(^\text{63}\text{Cu}\) (62.93960 u), what is the atomic weight of the other isotope?**
   - Options for the atomic weight of the other isotope are provided.

5. **Predict which ionic compound has the highest melting point:**
   a. NaF  
   b. KBr  
   c. MgO  
   d. CsBr  

6. **The pressure of O2 in a 15.0 L flask is 322 mm Hg at 44 °C. What mass of O2 is in the flask? (R = 0.08206 L·atm/mol·K)**  
   - Options are provided for the mass of O2.

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Would you like help with a specific question, or would you like to go through all of them one by one with detailed explanations?

Here are 5 follow-up questions related to chemistry concepts:

1. What characteristics define noble gases, and how do they differ from other elements?
2. How can you calculate the mass of a gas in a flask using the ideal gas law?
3. What are the steps to balancing a chemical reaction?
4. How do you determine the reducing agent in a chemical reaction?
5. What factors influence the melting point of ionic compounds?

**Tip:** To solve problems involving isotopic atomic weights, use the weighted average formula based on isotopic abundances.

The chemistry quiz containing multiple questions, including calculating the atomic weight of isotopes, identifying the noble gas, and using gas laws to find the mass of oxygen.

This chemistry quiz covers advanced topics such as calculating the atomic weight of isotopes using isotopic abundance, identifying noble gases, and applying the ideal gas law to determine the mass of oxygen in a flask. It is suited for college-level students.

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