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**Calculating the Mass of a Gas Collected Over Water**

Sometimes in the lab, we collect the gas formed by a chemical reaction over water. This method makes it easy to isolate and measure the amount of gas produced.

**Example Problem:**

Suppose the CO₂ gas evolved by a certain chemical reaction taking place at 30.0°C is collected over water, using an apparatus similar to the one in the sketch, and the final volume of gas in the collection tube is measured to be 26.8 mL.

**Objective:**

Calculate the mass of CO₂ that is in the collection tube. Round your answer to 2 significant digits. You can make any normal and reasonable assumptions about the reaction conditions and the nature of the gases.

**Sketch Explanation:**

The sketch depicts a typical gas-collection apparatus where:
- Collected gas is shown rising into the gas collection tube from the reaction container.
- The reaction container is connected via a tube where the chemical reaction takes place, producing the gas.
- Water is present in the collection tube, indicating the gas is collected over water.

**Response Box:**

There is a box for inputting the calculated mass of CO₂ in grams. Additionally, there are options to:
- Multiply the answer by 10.
- Clear the response.
- Access further help or information.

**Additional Tools:**

- Explanation button for detailed assistance.
- Check button for submitting and checking the answer. 

**Disclaimer:**

© 2021 McGraw Hill LLC. All rights reserved. Terms of Use and Privacy Center are available for reference, alongside accessibility information.
Transcribed Image Text:**Calculating the Mass of a Gas Collected Over Water** Sometimes in the lab, we collect the gas formed by a chemical reaction over water. This method makes it easy to isolate and measure the amount of gas produced. **Example Problem:** Suppose the CO₂ gas evolved by a certain chemical reaction taking place at 30.0°C is collected over water, using an apparatus similar to the one in the sketch, and the final volume of gas in the collection tube is measured to be 26.8 mL. **Objective:** Calculate the mass of CO₂ that is in the collection tube. Round your answer to 2 significant digits. You can make any normal and reasonable assumptions about the reaction conditions and the nature of the gases. **Sketch Explanation:** The sketch depicts a typical gas-collection apparatus where: - Collected gas is shown rising into the gas collection tube from the reaction container. - The reaction container is connected via a tube where the chemical reaction takes place, producing the gas. - Water is present in the collection tube, indicating the gas is collected over water. **Response Box:** There is a box for inputting the calculated mass of CO₂ in grams. Additionally, there are options to: - Multiply the answer by 10. - Clear the response. - Access further help or information. **Additional Tools:** - Explanation button for detailed assistance. - Check button for submitting and checking the answer. **Disclaimer:** © 2021 McGraw Hill LLC. All rights reserved. Terms of Use and Privacy Center are available for reference, alongside accessibility information.
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