Suppose the H2 gas evolved by a certain chemical reaction taking place at  35.0°C is collected over water, using an apparatus something like that in the sketch, and the final volume of gas in the collection tube is measured to be 88.7mL. Calculate the mass of H2 that is in the collection tube. Round your answer to 2 significant digits. You can make any normal and reasonable assumption about the reaction conditions and the nature of the gases.

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Sometimes in lab we collect the gas formed by a chemical reaction over water (see sketch at right). This makes it easy to isolate and measure the amount of gas produced.

Suppose the H2 gas evolved by a certain chemical reaction taking place at 

35.0°C is collected over water, using an apparatus something like that in the sketch, and the final volume of gas in the collection tube is measured to be 88.7mL.

Calculate the mass of H2 that is in the collection tube. Round your answer to 2 significant digits. You can make any normal and reasonable assumption about the reaction conditions and the nature of the gases.

 

Please don't round until the final step because the website is very senstive. Thank you for all your help! it means a lot. I have attached a picture of the problem as well. 

 

# Calculating the Mass of a Gas Collected Over Water

## Concept Overview
In laboratory settings, gases produced by chemical reactions are often collected over water. This method facilitates the isolation and measurement of the gas volume.

### Example
Consider a scenario where hydrogen gas (H₂) is generated from a chemical reaction at 35.0°C and collected over water using an apparatus similar to the one illustrated. The final volume of gas in the collection tube is measured to be 88.7 mL.

## Objective
Calculate the mass of the H₂ gas in the collection tube. Answers should be rounded to two significant digits. You may assume standard conditions and properties of gases for your calculations.

## Sketch Description
A sketch on the right side illustrates a gas-collection apparatus:
- **Collected Gas:** Shown at the top of the collection tube.
- **Water:** Indicated at the base of the collection system where gas displaces the liquid.
- **Chemical Reaction:** Occurs in a connected flask, generating the gas.

## User Interface
- An input field is provided for responding with the mass in grams (g).
- The system includes options for interaction, such as checking the answer.

For further explanation, a button labeled "Explanation" is available, and a "Check" button is provided for verifying the calculated result.

© 2021 McGraw Hill LLC. All Rights Reserved.
Transcribed Image Text:# Calculating the Mass of a Gas Collected Over Water ## Concept Overview In laboratory settings, gases produced by chemical reactions are often collected over water. This method facilitates the isolation and measurement of the gas volume. ### Example Consider a scenario where hydrogen gas (H₂) is generated from a chemical reaction at 35.0°C and collected over water using an apparatus similar to the one illustrated. The final volume of gas in the collection tube is measured to be 88.7 mL. ## Objective Calculate the mass of the H₂ gas in the collection tube. Answers should be rounded to two significant digits. You may assume standard conditions and properties of gases for your calculations. ## Sketch Description A sketch on the right side illustrates a gas-collection apparatus: - **Collected Gas:** Shown at the top of the collection tube. - **Water:** Indicated at the base of the collection system where gas displaces the liquid. - **Chemical Reaction:** Occurs in a connected flask, generating the gas. ## User Interface - An input field is provided for responding with the mass in grams (g). - The system includes options for interaction, such as checking the answer. For further explanation, a button labeled "Explanation" is available, and a "Check" button is provided for verifying the calculated result. © 2021 McGraw Hill LLC. All Rights Reserved.
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