{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Practice Exam IV Fall 2004

# Practice Exam IV Fall 2004 - Practice Exam IV 1 Calculate...

This preview shows pages 1–2. Sign up to view the full content.

Practice Exam IV 1) Calculate the heat required to melt 10.0 grams of ice (originally at 0.0°C) and then heat the water to 25° C. ΔH fus for ice = 6.02kJ/Mol Specific Heat of liquid water is 4.184 J/g K 2) Calculate ΔH° for the reaction 2Al(s) + 3Cl 2 (g) 2AlCl 3 (s) From the following data: 2Al(s) + 6HCl(aq) 2AlCl 3 (aq) + 3H 2 (g) ΔH° = -1049 kJ HCl(g) HCl(aq) ΔH° = -74.8 kJ AlCl 3 (s) AlCl 3 (aq) ΔH° = -323 kJ And ΔH f ° of HCl(g) = -922.5 kJ 3) Predict which material has a higher entropy and explain your reasoning a) A solid, paramagnetic metal at 298 K with NO permanent magnetic field present (other than that of the earth which we can ignore for this question) b) The same solid, paramagnetic metal at 298 K in the presence of a large magnetic field from a nearby electromagnet 4) Consider the reaction: H 2 (g) + CO(g) HCHO(g) ΔH° = 1.96 kJ/mol ΔS° = -109.58 J/K a) Calculate ΔG° at 298 K b) Determine the temperature, if any, at which the reaction would become spontaneous.

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