Answer:
12.3kPa
Explanation:
Using Dalton's law which states: in a mixture of gases the total pressure is equal to the sum of the pressures of all gases present. In this question,
Total Pressure = Pressure of Hydrogen + Pressure of water vapor
Pressure of Hydrogen = 122.4kPa
Total Pressure 134.7kPa.
Pressure of water vapor = Total pressure - Pressure of Hydrogen =
134.7kPa - 122.4kPa = 12.3kPa.
Vapor pressure of water at certain temperatures is is usually available in vapor pressure table. In this question temperature here is 323 K.
Convert 323 K to celsius (using the formula Celsius = K -273) will give us 323 k -273 = 50 degrees celsius. Checking the vapor pressure of water at 50 degrees celsius will show you 12.34kPa
