Page 39 - Physical chemistry eng
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16 CHAPTER 1 Fundamental Concepts of Thermodynamics
P1.36 A glass bulb of volume 0.198 L contains 0.457 g of gas P1.39 Many processes such as the fabrication of integrated
at 759.0 Torr and 134.0°C. What is the molar mass of the gas? circuits are carried out in a vacuum chamber to avoid reac-
= tion of the material with oxygen in the atmosphere. It is dif-
P1.37 Use L’Hôpital’s rule, limCf(x)>g(x)D x:0
ficult to routinely lower the pressure in a vacuum chamber
df(x)>dx
limc d to show that the expression derived for below 1.0 * 10 -10 Torr. Calculate the molar density at this
dg(x)>dx x:0 pressure at 300. K. What fraction of the gas phase molecules
P in part (b) of Example Problem 1.1 has the correct limit initially present for 1.0 atm in the chamber are present at
f
as g : 0 . 1.0 * 10 -10 Torr?
3
P1.38 A 455 cm vessel contains a mixture of Ar and Xe. If the P1.40 Rewrite the van der Waals equation using the molar
mass of the gas mixture is 2.245 g at 25.0°C and the pressure is volume rather than V and n.
760. Torr, calculate the mole fraction of Xe in the mixture.
