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A mixture of H2 and water vapor is present in a closed vessel at 20°C. The total pressure of the system is 755.0 mmHg.


Partial pressure of water vapor at 20°C equals 17.5 mmHg.


What is the partial pressure of H2?

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justcansada

THE ANSWER IS: 737.5

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Answer: The partial pressure of \(H_2\) is 737.5 mmHg.

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.

\(p_{total}=p_A+p_B\)

Thus \(p_{total}=p_{H_2O}+p_{H_2}\)

Given: \(p_{total}=755.0mmHg\)

\(p_{H_2O}=17.5mmHg\)

\(p_{H_2}= ?mmHg\)

Thus \(755.0mmHg=17.5mmHg+p_{H_2}\)

\(p_{H_2}=737.5mmHg\)

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