Question

You are experimenting with an ethanol and water mixture with a mole fraction of ethanol equal to 0.39. See graph

Based on the equation above, what is the value of the correct ?Hvap to use in this experiment?

You measure the starting pressure and temperature of your system as 1.08 atm and 23.3°C, respectively. What is the pressure of the ethanol-water system at a new temperature of 34.9°C?

Δ Hvap versus Xethanol 42.5 42.0 41.5 41.0 40.5 40.0 39.5 39.0 yー-3.7052x+ 42.516 R2 0.9663 0.2 0.40.6 0.8 1.0 Mole Fraction of Ethanol