Answer Key Quiz 3B Spring 2006

Answer Key Quiz 3B Spring 2006 - C HM 2046 Quiz 3B Answer...

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CHM 2046 Quiz 3B March 31, 2006 Answer all questions. Look at the end for useful information. 1. Consider the two reactions below. Mg (s) + ½O 2 (g) MgO (s) G° = - 569 kJ 2CO 2 (g) 2CO (g) + O 2 (g) G° = + 514 kJ a) (4 points) What is the resulting reaction obtained from coupling the above reactions together (no O 2 (g) should appear)? Multiply the first by 2, or divide the second by ½, and add together 2 Mg (s) + 2 CO 2 (g) 2 MgO (s) + 2 CO (g) or Mg (s) + CO 2 (g) MgO (s) + CO (g) b) (4 points) What is G° for the reaction in part a)? Multiply the second by 2, or divide the first by ½, and add together For 2 Mg (s) + 2 CO 2 (g) 2 MgO (s) + 2 CO (g) G° = -1138 kJ + 514 kJ = -624 kJ For Mg (s) + CO 2 (g) MgO (s) + CO (g) G° = - 569 kJ + 257 kJ = -312 kJ 2. The reaction below at 298 K has an equilibrium constant of 3.89 x 10 -34 . 2 HCl (g) H 2 (g) + Cl 2 (g) a) (2 points) Does the equilibrium lie far to the left, far to the right, or
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Answer Key Quiz 3B Spring 2006 - C HM 2046 Quiz 3B Answer...

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