Chemistry Practice Problems Collecting Gas Over Water Practice Problems Solution: The hydrogen gas formed in a chemical reaction is ...

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Solution: The hydrogen gas formed in a chemical reaction is collected over water at 30.0°C at a total pressure of 728 mmHg.Part AWhat is the partial pressure (mmHg) of the hydrogen gas collected in this way? Part B If the total volume of gas collected is 724 mL, what mass (g) of hydrogen gas is collected? 

Problem

The hydrogen gas formed in a chemical reaction is collected over water at 30.0°C at a total pressure of 728 mmHg.

Part A

What is the partial pressure (mmHg) of the hydrogen gas collected in this way? 



Part B 

If the total volume of gas collected is 724 mL, what mass (g) of hydrogen gas is collected? 


Solution

For problems that involve collecting gas over water, we should note that the total pressure is the sum of the partial pressure of the gas and water. We have to look for the value for the partial pressure of water at a certain temperature from literature (books/tables). 

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