{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

M1 Entropy &amp; Gibbs Free Energy Problems

# M1 Entropy &amp; Gibbs Free Energy Problems - Solomons...

This preview shows pages 1–6. Sign up to view the full content.

S olomon’s Study Notes General Chemistry CHE 132 Spring 2009 Midterm 1 Solomon Weiskop PhD Chapter 18 Practice Problems (Entropy & Gibbs Free Energy)

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

View Full Document
Study Notes & Practice Problems are available to print out by registering at www.solomonlinetutor.com Solomon Weiskop PhD Solomon’s CHE 1 32 Tutoring © Copyright 2009
1 Problems numbered in blue were written by Prof. Hanson [#1] Which statement about entropy is not correct? [Sp08Mid1#14] Note: q = energy transferred T = Kelvin temperature (a) Rudolf Clausius discovered the significance of the ratio q/T in his studies of heat engines, and called this quantity entropy. (b) Ludwig Boltzmann had the idea that entropy is a measure of the number of states over which energy is dispersed (c) The entropy of the system is zero when the system can only be in one state (d) In any spontaneous process, the entropy of the universe increases (e) In an endothermic process, the entropy of the system decreases [#2] If two quanta (units) of energy are distributed over 100 atoms, what is the probability of finding the energy dispersed, i.e. each quantum on a different atom. [Sp08Mid1#15] (a) 0.99 (b) 0.98 (c) 0.97 (d) 0.96 (e) 0.95 [#3] Which one of the following relationships is not correct? [Sp08Mid1#18] [#4] Which statement is not correct? [Sp07Mid2#10] A spontaneous reaction always _______

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

View Full Document
2 [#5] For the following constant-temperature process which one is not correct? [#6] Which one is not correct? In any spontaneous process (a) ΔS univ > 0 (b) ΔS sys + ΔS surr > 0 (c) ΔS univ < 0 (d) ΔG sys < 0 (e) ΔS tot > 0 [#7] 6 moles of liquid water at 0°C freezes in a freezer set at 25°C. ΔH fus (water) = 6.01 kJ/mol What is the total entropy change (ΔS univ )? [#8] An ice cube with a mass of 9.00g falls into a swimming pool and melts. The temperature of the ice cube was 0°C and the temperature of the swimming pool was 20°C. Determine the change in entropy of the swimming pool caused by the ice cube melting. [Sp07Mid2#11] Given: for water ΔH fusion = 6.00kJ/mol MM = 18g/mol (a) +20.5 J/K (b) 10.2 J/K (c) +11.0 J/K (d) 20.5 J/K (e) +10.2 J/K [#9] Using the data below determine the standard entropy change for the following reaction [Sp08Mid1#20] N 2 g + 3H 2 g 2NH 3 g Substance S 0 in J/molK N 2 (g) 191.6 H 2 (g) 130.7 NH 3 (g) 192.8 (a) 0 because entropy is conserved in a chemical reaction (b) +129.5 J/K (c) +198.1 J/K (d) 129.5 J/K (e) 198.1 J/K
3

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

View Full Document
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