lecture 08 - You apply for a summer job in an analytical...

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1 1 2 Ag 2 O(s) 4 Ag + O 2 (g) G o f (kJ/mol) -11.7 0 0 H o f (kJ/mol) -31.1 0 0 S o (J/mol) 121 43 205 You apply for a summer job in an analytical lab at a silver mine in the beautiful Black Hills of South Dakota. On the application form, they ask to what temperature does silver oxide need to be heated in order to produce silver metal from the ore. What is your answer? Respond in K: xxx G = H - T S 2 2 Ag 2 O(s) 4 Ag + O 2 (g) G o f (kJ/mol) -11.7 0 0 H o f (kJ/mol) -31.1 0 0 S o (J/mol) 121 43 205 S o = 205 + 4(43) – 2(121) = 135 J K -1 = 0.135 kJ K -1 H o = 0 – 2(-31.1) = 62.2 kJ G = 62.2 – T (0.135) = 0 (An entropy driven reaction!) T = 62.2/ 0.135 = 461 K You apply for a summer job in an analytical lab at a silver mine in the beautiful Black Hills of South Dakota. On the application form, they ask to what temperature does silver oxide need to be heated in order to produce silver metal from the ore. What is your answer? Respond in K: xxx
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2 3 Solar ID Room 000000000 – 106760925 Javits 100 Main Floor 106760926 – 107002402 Javits 100 Balcony 107002403 – 107056430 Earth & Space Science 001 107056431 – 107095749 Old Chemistry 116 107095750 – 107126933 Javits 102 107126934 – 107170192 Harriman Hall 137 107170193 – 107226075 Engineering 143 107226076 – 107259505 Javits 101 107259506 – 107276858 Javits 103 107276859 – 107314468 Javits 109 107314469 – 999999999 Javits 111 Room Assignments for Exam 1 Thursday, February 11 th , 8:30 – 10:00 PM 5 Bonds & Energy Energy No bond between 2 atoms. 2 atoms bonded together with a weak bond 2 atoms bonded together with a strong bond, more stable! Breaking a bond takes energy, forming a bond releases energy. Energy is released if a weak bond is broken and a strong bond is formed.
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3 6 Todays To Do Identify the temperatures at which reactions will be spontaneous from the sign and magnitude of the enthalpy change and the entropy change.
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This note was uploaded on 02/12/2010 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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lecture 08 - You apply for a summer job in an analytical...

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