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Practice Quiz 3A 2009.doc

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Department
Chemistry
Course
CHM 2046
Professor
Christou
Semester
Spring

Description
CHM 2046 Quiz 3A March 31, 2006 Answer all questions.  Look at the end for useful information. 1. Consider the two reactions below. 2 Mg (s) + O  (2) → 2 MgO (s)  ΔG° = ­ 1138 kJ  CO  2g) →  CO (g) + ½O  (g) 2 ΔG° = + 257 kJ a) (4 points)  What is the resulting reaction obtained from coupling the above reactions together (no  O 2(g) should appear)? b) (4 points)  What is ΔG° for the reaction in part a)? ΔG° =  2. The reaction below at 298 K has an equilibrium constant of 3.89 x 10 . ­34 2 HCl (g) ⇌ H  (g2 + Cl  (g2 a) (2 points)  Does the equilibrium lie far to the left, far to the right, or somewhere near the middle?         The equilibrium lies (                                        ). b) (7 points)  Calculate ΔG° for this reaction. c) (7 points)  What is ΔG for this reaction at 300 K when the partial pressures (p) of each species are  as follows:  p(HCl) = 0.2 atmospheres, p(H ) = 3 a2mospheres, p(Cl ) = 0.4 at2ospheres? d) (4 points)  Calculate ΔG° for the reaction below at 298 K: 2 NOCl (g)   →  2 NO (g) + Cl  (g) 2 ΔH° vafues (kJ/mol):  NO(g) = 90.29     Cl (g) = 0200       NOCl (g) = 51.71 S° values (J/mol.K):    NO(g) = 210.7      Cl (g) 2 223.1     NOCl(g) = 261.1 ΔG°  falues (kJ/mol):  NO(g) = 86.5       Cl (g) =20.0         NOCl (g) = 66
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