Chem_126_2009_Common_3_1zz0ani3

Chem_126_2009_Common_3_1zz0ani3 - Chem 126 Common 3 Part I...

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Chem 126 Common 3 Part I April, 24, 2009 1. What is the oxidation state of manganese in 1 4 MnO - ? (a) 1 (b) 2 (c) 3 (d) 5 (e) 7 2. Which of the following compounds has the largest entropy? Careful (a) H 2 (g) (b) H 2 O (g) (c) H 2 O (l) (d) H 2 O (s) (e) SiO 2 (s) 3. What is the change in E, when 2.0 x 10 3 J of heat is lost and the system expands from 1.0 to 11.0 L against an external pressure of 1.4 atm. (1 L·atm = 101.3 J) (a) -3,400 J (b) -600 J (c) 3,400 J (d) 600 J (e) -2,000 J 4. For which of the following processes is the change spontaneous? (a) The change in entropy of the universe decreases. (b) At constant pressure, H sys > 0 (endothermic), S sys > 0 and T is very small. (c) At constant pressure, H sys > 0 (endothermic), S sys > 0 and T is very large. (d) Ln(Q/K eq ) > 0 (e) The voltage for the reaction < 0. ( 29 ( 29 ( 29 ( 29 3 3 -1 1 kJ/mol -239 -201 Jmol 127 240. o f o f CH OH l CH OH g H S K - 5. Calculate the boiling point of methanol (CH 3 OH). (a) 0.336 K (b) 1198 K (c) 348 K (d) 342 K (e) 336 K 6. Calculate the approximate vapor pressure of methanol at 300 K. (a) 0.022 atm (b) 0.19 atm (c) 0.50 atm (d) 0.29 atm (e) > 1 atm
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7. Calculate the change in entropy for the following reaction: N 2 H 4 (l) + 2O 2 (g) 2NO 2 (g) + 2H 2 O (l ) ( 29 / / : 121 205 240 70 o f S J mol K (a) 86 Jmol -1 K -1 (b) -16 Jmol -1 K -1 (c) 16 Jmol -1 K -1 (d) -89 Jmol -1 K -1 (e)
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Chem_126_2009_Common_3_1zz0ani3 - Chem 126 Common 3 Part I...

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