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# q5f09 - Version PREVIEW Quiz 5 JOHNSON(53755 This print-out...

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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: Δ 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 Δ H rxn = - Δ H cal = - mc Δ T - mc Δ T n = - 1000 g · 4 . 184 J g · K · 12 . 98 K 0 . 01 mol = - 5 , 430 kJ · mol 1 LDE Hess’ Law 001 002 5.0 points Given the following data: Fe 2 O 3 (s) + 3CO(g) ←→ 2Fe(s) + 3CO 2 (g) Δ H = -

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q5f09 - Version PREVIEW Quiz 5 JOHNSON(53755 This print-out...

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