Question

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?

Answer 1

THE ANSWER IS: 737.5

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Answer 2

Answer: The partial pressure of
`H_2` is 737.5 mmHg.

Step-by-step 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`