March 20, 2009

# March 20, 2009 - Total Entropy Entropy change for...

This preview shows pages 1–7. Sign up to view the full content.

March 20, 2009

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

View Full Document
Total Entropy Entropy change for vaporization at 400K ΔS = 32,000/400 = 80J mol -1 k -1 +32000J of heat added from surroundings q surroundings = -24,000 And ΔS sur = -24000/400 = -80J K -1 mol -1 ΔS univ = ΔS sys + ΔS sur = 80 -80 = 0 For this equilibrium phase transition
Vaporization is spontaneous (not reversible) if surroundings are 410K ΔS sys = + 80 still But ΔS sur = -32,000/410 = -78 ΔS uni = +80 -78 = +2J K -1 mol -1 Total entropy always increases for a spontaneous process

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

View Full Document
Condensation Put vapor at 400K in a cold bath at 390K ΔS condensation = -32000/400 = -80 ΔS sur = +32,000/390 = 82 ΔS univ = -80 + 82 = +2 for spontaneous
Entropy of universe always increases for spontaneous process “time’s arrow” Positive time is different from negative time because entropy increases for + time Universe heat death - heat moving from higher to lower temperature is spontaneous - can get work Eventually whole universe is same T ( about 3K) all heat no work possible This is heat death

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

View Full Document
Schrodinger’s question
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern