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Handout3_Chapter7and14

Handout3_Chapter7and14 - Chemistry 008 Dr Neal Abrams...

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Chemistry 008 Handout #3 Dr. Neal Abrams brought to you by the Spring 2007 Learning Strategies Center NOTE: This review sheet is for Chem 008 attendees and is to be used in conjunction with lecture notes, handouts, problem sets, the textbook, the laboratory manual, and notes from Chem 008. Chapter 7 and 14 Review Guide Lectures 2/6 and 2/8 I. Hess’s Law a. Add reactions of known H values. Multiply or reverse to get appropriate amounts and to cancel unwanted substances i. Given: A + B C H = -x ii. reverse reactions C A + B reverse H H = + x iii. multiply reactions 2 A + 2 B 2 C multiply H H = -2x b. Use standard enthalpy of formations ( f ): enthalpy change associated with the formation of 1 mole of a substance from the pure elements in their most stable form under standard conditions (1 atm and 298K). f element in stable form = 0 i. H rxn = coefficients( f products) - coefficients( f reactants) II. Calculation of
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Handout3_Chapter7and14 - Chemistry 008 Dr Neal Abrams...

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