rue - False (correct the false statements to make them true) a. The normal freez
ID: 713771 • Letter: R
Question
rue - False (correct the false statements to make them true) a. The normal freezing point is the temperature where the vapor pressure of the liquid is equal to 1 atm.b. Along any line in a 1 component phase diagram, f = 1.c. At any triple point in a 1 component system, f = 0.d. The relation d ln p/ dt = H/ RT2 is appropriate for a liquid solid phase change. e. For a reversible phase change at constant T and p, S = H / T.f. For a one component system, the maximum number of phases that can exist in equilibrium is three.g. The volume of a solution at T and P equals the sum of the volumes of the pure components at T and p.h. Intermolecular interactions are negligible in an ideal solution.i. At constant T and p, mixG must be negative for an ideal solution.j. At constant T and p, mixS = mixH / T for an ideal solution.k. mixS at constant T and p must be negative.
Explanation / Answer
a. False. The normal boiling point is the temperature when the vapor pressure of the liquid is equal to 1 atm.
b. True. Along any line in a 1 component phase diagram, f = 1.
c. True. At any triple point in a 1 component system, f = 0.
d. False. The relation d ln p/ dt = delta H/ RT2 is appropriate for a liquid-vapour phase change.
e. True. For a reversible phase change at constant T and p, delta S = delta H / T.
f. True. For a one component system, the maximum number of phases that can exist in equilibrium is three.
g. False. The volume of a solution at T and P equals the sum of the volumes of the pure components at T and p divided by their respective number of moles.
h. False. Intermolecular interactions are not negligible in an ideal solution.
i. True. At constant T and p, delta mixG must be negative for an ideal solution.
j. False. At constant T and p, delta mixS = -nR(x1 lnx1 + x2 +lnx2) for an ideal solution.
k. True. delta mixS at constant T and p must be negative.
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