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Exam 3 Form B Key fall 07CHEM103A Dr. Keller

Exam 3 Form B Key fall 07CHEM103A Dr. Keller - Chemistry...

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Chemistry 103A Exam 3, Form B ANSWER KEY 1. Use the bond energies in the table on the last page to calculate the enthalpy of reaction for the reaction below. HCCH + 5 F 2 → 2 HF + 2 CF 4 (a) -2092 kJ (b) -616 kJ (c) -854 kJ (d) -2294 kJ (e) -482 kJ 2. (2) Determine the Lewis structure of the compound below and choose the number of shared (bonds) and unshared electron pairs. The atoms are connected as shown. The octet rule must be obeyed. FNCNF 3. Use the bond energies in the table on the last page to calculate the enthalpy of reaction for the reaction below. 2 NH 3 → 2 H 2 + HNNH 4. (2) Determine the Lewis structure of the compound below and choose the number of shared (bonds) and unshared electron pairs. The atoms are connected as shown. The octet rule must be obeyed. CO
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