The total pressure of the gas is calculated as 849 mmHg.
What is partial pressure?
The term partial pressure is the pressure that is exerted by an individual gas in a mixture of gases.
In this case, the partial pressures of hydrogen and water are 789 mmHg and 60 mmHg respectively.
Thus, the total pressure of the gas = 60 mmHg + 789 mmHg = 849 mmHg.
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