q5f09 - Version PREVIEW Quiz 5 JOHNSON (53755) 1 This...

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Unformatted text preview: Version PREVIEW Quiz 5 JOHNSON (53755) 1 This print-out should have 8 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. LDE Bomb Calorimeter 001 001 5.0 points For this problem assume that the calorime- ter itself absorbs no heat. If we set up a bomb calorimetry experiment to determine the molar enthalpy of combustion of octane (C 8 H 18 ) using 1 L of water as our heat sink, 1 . 142 g of octane, and measure an initial and final temperature of 25 . 01 C and 37 . 99 C, respectively, what will be the experimentally determined molar enthalpy of combustion of octane? Assume the density of water is 1 . 00 g mL 1 . The specific heat capacity of water is 4 . 184 J g 1 K 1 . 1.- 543 kJ mol 1 2.- 54 . 3 kJ mol 1 3.- 5 , 430 kJ mol 1 correct 4.- 54 , 300 kJ mol 1 5.- 5 . 43 kJ mol 1 Explanation: T = T f- T i = 37 . 99 C- 25 . 01 C = 12 . 98 C = 12 . 98 K m = 1 L 1000 mL L 1 . 00 g mL = 1000 g n = 1 . 142 g octane 114 . 26 g mol = 0 . 01 mol H rxn =- H cal =- mc T- mc T n =- 1000 g 4 . 184 J g K 12 . 98 K . 01 mol =- 5 , 430 kJ mol...
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This note was uploaded on 03/04/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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q5f09 - Version PREVIEW Quiz 5 JOHNSON (53755) 1 This...

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