How Do You Calculate The Pressure Of Hydrogen Gas Collected Over Water?

How Do You Calculate The Pressure Of Hydrogen Gas Collected Over Water? 1: Vapor Pressure of Water as a Function of Temperature. The resulting hydrogen gas is collected over water at 25°C, while the barometric pressure is 745.4 mmHg. What volume of wet hydrogen will be collected? pH 2 = ptotal– pH 2O = 754