practice exam2 with solutions

practice exam2 with solutions - 1 Two moles of liquid A are...

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1. Two moles of liquid A are mixed with 1 mole of liquid B and form an ideal solution. The process is preformed at constant temperature T and pressure P. A. What is the change of entropy as a result of mixing? See Lecture notes: S = -R n 1 ln(n 1 /(n 1 +n 2 )) - R n 2 ln(n 2 /(n 1 +n 2 )) = -R[2 ln(2/3) + 1ln(1/3)] = 1.91 R = 15.86 J/K B. What is G? See lecture notes again G = -T S = -1.91 RT C. What is the heat q released as a result of mixing? For an ideal solution, q = H = 0 (see Lecture notes) D. What is the difference, V, between the volume of the mixture and the total volume of separated A and B? This is your homework problem, the answer is V=0
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2. Sublimation is a phase transition, in which a solid substance is directly converted into a gas without passing through the liquid state. Does the sublimation temperature increase or decrease when pressure is raised? Explain in detail what equations you had to use to arrive at your conclusion.
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practice exam2 with solutions - 1 Two moles of liquid A are...

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