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.

Answer 1

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 $755.0mmHg=17.5mmHg+p_{H_2}$

$p_{H_2}=737.5mmHg$

Answer 2

THE ANSWER IS: 737.5

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