Answer: The partial pressure of [tex]H_2[/tex] 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.
[tex]p_{total}=p_A+p_B[/tex]
Thus [tex]p_{total}=p_{H_2O}+p_{H_2}[/tex]
Given: [tex]p_{total}=755.0mmHg[/tex]
[tex]p_{H_2O}=17.5mmHg[/tex]
[tex]p_{H_2}= ?mmHg[/tex]
Thus [tex]755.0mmHg=17.5mmHg+p_{H_2}[/tex]
[tex]p_{H_2}=737.5mmHg [/tex]
