CHEM104 Lecture Notes - Lecture 4: Intermolecular Force, Covalent Bond, Joule
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Molecules of vapor lose energy, get captured by liquid. Pressure of a gas in dynamic equilibrium with its liquid. Higher vapor p more volatile liquid. When you increase temperature, vapor pressure will increase. Boiling: vapor bubbles forming anywhere in the liquid. Boiling point: temperature at which vapor pressure equals external pressure. Normal boiling point: temperature at which vapor pressure equals 1 atm http://www. science. uwaterloo. ca/~cchieh/cact/c123/clausius. html. The vaporization curves of most liquids have similar shape. The vapour pressure steadily increase as the temperature increases. A good approach is to find a mathematical model for the pressure increase as a function of temperature. Experiments showed that the pressure p, enthalpy of vaporization, dhvap, and temperature t are related, P = a exp (- dhvap / r t) Where r (= 8. 3145 j mol-1 k-1) and a are the gas constant and unknown constant. This is known as the clausius- clapeyron equation. If p1 and p2 are the pressures at two temperatures t1 and.