Hello everyone,
I have a question about gas adsorption with the presence of vapor pressure. We know that the partial pressure of H2O at 300 K is equal to 3.537 kPa. If we want to use this data and examine the influence of vapor water on the adsorption mixture of CH4/CO2 in range of pressure, How should we set the input data? 
For example, in the below paper section 3.2, effect of water vapor on the amount of CO2 and CH4 adsorption for 0.1-30 bar was estimated. For each pressure, what is the amount of water vapor in the sorption module? (link of paper: https://doi.org/10.1021/jp5099987)
For 100 kPa, the input data for CH4=95 kPa and CO2=5 kPa, but how about H2O?  
I would appreciate it if someone could help me.