Exam 2 - 1st Version - Solution

Exam 2 - 1st Version - Solution - Name_Solution_ EMA 4314...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Name__Solution________________ EMA 4314 Fall 2010 Exam #2 (100 points) There are four questions, each worth 33 points (you get 1 point for writing your name above). You will receive credit for 3 questions only; if you attempt all 4, you will get credit for the best 3. Question 1 [Energy and its analysis] a. The Helmholtz free energy, A, is a measure of the capacity of a system for what? Contrast this with G, U and H (10 points) A is the capacity of the system to do mechanical (P-V) work G is the capacity of the system to do non-mechanical work The heat added to a system at constant volume is the change in U of the system The heat added to a system at constant pressure is the change in H of the system b. Beginning from the equation for the combined First and Second Laws of thermodynamics, and the definitions of A and G, determine dA and dG. Show your work. (8 points) A = U-TS dA = dU – TdS -SdT But dU= TdS - PdV So dA = -SdT - PdV Likewise G = U + PV –TS dG = dU + PdV +VdP –TdS – SdT = TdS – PdV + PdV +VdP –TdS – SdT dG = -SdT + VdP c. From the result of (b) show that . Show your work. (5 points) dG = VdP - SdT d. From the result of (b) show that . Show your work. (10 points) Euler Equation (where k and a are the isothermal compressibility and isobaric thermal expansion) Question 2 [Phase transitions]
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
a. On the axes below sketch the temperature dependence of the chemical potential
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/16/2011 for the course EMA 4314 taught by Professor Phillpot during the Fall '10 term at University of Florida.

Page1 / 5

Exam 2 - 1st Version - Solution - Name_Solution_ EMA 4314...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online