1. we make ln P dimensionless by divi
v.p. (mmHg) | ln (P /1mm Hg) | (T/K) | 1/(T/K) |
40 | 3.689 | 305 | 0.003279 |
60 | 4.094 | 313 | 0.003195 |
80 | 4.382 | 320 | 0.003125 |
100 | 4.605 | 325 | 0.003077 |
(a) Slope of line is = -4504 K
(b) slope = -vap H /R = -4504 K
vap H = 4504 K * 8.314 J/K-mol = 37446 J/mol = 37.45 kJ/mol
(c) Normal boiling point : P = 1 atm or 760 mmHg :
we have : ln (P /1mm Hg) = -4504 / (T/K)+A (intercept) = -4504 / (T/K)+18.5
ln 760 = 6.63 = -4504 / (T/K)+18.5
T = Tb = 379.5 K = 106.5 C
(d) " Substance melts at T when vapor pressure of the substance in its solid phase is equal to its vapor pressure in the liquid phase" P = ?
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