課程名稱︰物理化學一
課程性質︰化工必修
課程教師︰陳立仁
開課學院：工學院
開課系所︰化工系
考試日期（年月日）︰2007/01/04
考試時限（分鐘）：70min
是否需發放獎勵金：Yes
（如未明確表示，則不予發放）
試題 :
Physical Chemistry (Quiz for Chapter5)
Problem 1 (20%)
(a) Two grams of benzoic acid (C6H5COOH) dissolved in 25g of benzene produce
a freezing point depression od 1.65K. The freezing point depression
constant for benzene is 5.07K kg/mol. Find the molecular mass of benzoic
acid from these data and interpret the answer.
(b) Two grams of LiF dissolved in 100g of water produces a freezing point
depression of 2.9K. What molecular mass do these data give for LiF, and
why isn't the answer 26 g/mol? The freezing point depression constant
for water is 1.86 K kg/mol.
Problem 2 (20%)
The vapor pressure of pure ethylene dibromide is 172 Torr and that of
pure propylene dibromide is 128 Torr both at 358 K. If these two
components follow Raoult's law, estimate the total vapor pressure and
the vapor composition in equilibrium with a solution that is 0.60 mol
fraction propylene dibromide at 358 K. Calculate the fugacity for each
component in the solution. List the necessary assumptions.
Problem 3 (20%)
The vapor pressure of CO2(s) is 0.0386 atm at 162.0 K and 0.395 atm at
184.0 K. Find the molar enthalpy of sublimation of CO2, the standard
sublimation temperature of CO2 (the temperature at which the solid vapor
pressure is 1 atm), and the slope of the solid-vapor coexistence curve,
(dP/dT)sublimation, at this temperature.
Problem 4 (20%)
The saturated vapor pressure of water at 100度C is 101.325 kPa. If a
nonvolatile solute 11.5g NaCl is dissovled in 100g water at 100度C.
The vapor pressure is 95.325 kPa. Calculate the activity and activity
coefficient of water in the liquid phase.
Problem 5 (20%)
Mikhail and Kimel, J. Chem. Eng. Data 6, 533 (1961), give the density
of a water(1)-methanol(2) solution in a g/cm^3 at 298 K related to the
mole fraction x2 of the methanol through the equation
密度p[g/cm^3]=0.9971-0.28930(x2)+0.29907(x2)^2
Calculate the partial molar volume of component 2 (methanol) at 298 K
when x2=0.050.
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