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ECH152B_HW2

# ECH152B_HW2 - i and b i are constants Because the equation...

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ECH 152B Homework #2 Due: Friday, January 22, 2010 1) The compound p-azoxyanisole forms a liquid crystal. 5.0 g of the solid was placed in a tube, which was then evacuated and sealed. Use the phase rule to prove that the solid will melt at a single temperature and that the liquid crystal phase will make a transition to normal liquid phase at a single temperature. 2) If the molar density of a binary mixture is given by the empirical expression: ρ= a 0 + a 1 x 1 + a 2 x 1 2 find the corresponding expressions for g G ± and g ² ³ . 3) For a particular binary liquid solution at constant T and P, the molar enthalpies of mixtures are represented by the equation: H = x 1 (a 1 +b 1 x 1 ) + x 2 (a 2 + b 2 x 2 ) where the a
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Unformatted text preview: i and b i are constants. Because the equation has the form of Eq. (11.11), it might be that ´ µ ³ = a i + b i x i . Show whether this is true. 4) A vessel, divided into two parts by a partition, contains 4 mol of nitrogen gas at 75 o C and 30 bar on one side and 2.5 mol of argon gas at 130 o C and 20 bar on the other. If the partition is removed and the gases mix adiabatically and completely, what is the change in entropy? Assume nitrogen to be an ideal gas with C V = (5/2) R and argon to be an ideal gas with C V = (3/2) R. 5) Estimate the fugacity of isobutylene as a gas: a. At 280 o C and 20 bar b. At 280 o C and 100 bar...
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• Spring '10
• KIM
• Liquid crystal, liquid crystal phase, binary liquid solution, normal liquid phase, compound p-azoxyanisole forms

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