Pressure inside a heated sealed vessel

[ouertani rachid]

Please can you help me de find out the calculation steps leading to the partial pressure inside a heated closed vessel with 25 ml total capacity but filled 20mL with aquous mixture of 2 acids(HNO3/HF ;1/3)..I think to simplify the problem we could at a fisrt approximation assume that the mixture is water.. Experimentally we fixed the temperature to T1=80 ; 100 then 120°C.

 

[mfb]

To a good approximation, the partial pressure from water will be given by the vapour/liquid boundary in the phase diagram, add the atmospheric pressure from air if you start the experiment with air inside.