# Saturation Temperature of Binary Mixture

I have a binary mixture of water and methane. The system is at 2000kPa and I am trying to find the saturation temperature of the water in the mixture.

I know Tsat is a function of partial pressure, but cant find a formula. I do not know the ratio of water to methane in the system.

I do know that the system is currently at 100C. If I assumed that 100C is the Tsat for the water, is there a way to calculate the ratio of water to methane?

• From Fundamentals of Classical Thermodynamics, I have the saturation temperature for water at 2,000 kPa as 212$^{\circ}$C. That could make a difference from your assumption of 100$^{\circ}$C. – Carlton Oct 21 '15 at 16:07
• So would I be right in saying that the partial pressure of water in the system woud be 100kPa. Therefore the system would be 5% water? – quanticks Oct 21 '15 at 19:15
• You really need to know the relative amounts of each component to calculate partial pressure. – Carlton Oct 21 '15 at 19:29