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#1 Your organization has developed a new material to be used in the preparation

ID: 915348 • Letter: #

Question

#1 Your organization has developed a new material to be used in the preparation of paints for high performance vehicles. Some vapor pressure data have been measured for both the vapor-liquid and solid-vapor equilibrium. These are shown below.

Independently we have found measurements of the molar volumes for the solid at 25 C and 1 atm to be 80 cc/mole and for the liquid at 50 C and 1 atm to be 90 cc/mole.

temperature (oC)

Pressure (bar)

Phases

0

0.08

SV

25

0.10

SV

50

0.115

VL

75

0.127

VL

a. What is your best estimate of the triple point of this material?
b. Estimate the heats of vaporization, sublimation and fusion at the triple point. c. Estimate the boiling temperature at a pressure of 0.15 bar.
d. What is your best estimate of the melting pressure at 50 C?

temperature (oC)

Pressure (bar)

Phases

0

0.08

SV

25

0.10

SV

50

0.115

VL

75

0.127

VL

Explanation / Answer

#1 Your organization has developed a new material to be used in the preparation