emzhao327 emzhao327

11-02-2019
Chemistry

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The diagram below shows the collection of H2 gas over water at 25°C. The total pressure in the tube is 760.0 torr. What is the pressure exerted by the hydrogen gas alone? (Hint: water vapor pressure = 23.8 torr @ 25°C)

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kobenhavn kobenhavn

20-02-2019

Answer: 736.2 torr

Explanation: According to Dalton's law, the total pressure of a mixture of gases is the sum of individual pressures exerted by the constituent gases.

[tex]p_{total}=p_A+p_B[/tex]

Thus [tex]p_{total}=p_{H_2O}+p_{H_2}[/tex]

Given: [tex]p_{total}=760 torr[/tex]

[tex]p_{H_2O}=23.8torr[/tex]

[tex]p_{H_2}= ?torr[/tex]

Thus [tex]760torr=23.8torr+p_{H_2}[/tex]

[tex]p_{H_2}=736.2torr[/tex]

Thus pressure exerted by the hydrogen gas alone is 736.2 torr.

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