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H13- extra edition-solutions

# H13- extra edition-solutions - marquez(ecm739 H13 extra...

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marquez (ecm739) – H13: extra edition – McCord – (53110) 1 This print-out should have 5 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points This is an extra homework to bring our total to 13. This means you get to drop your 3 lowest homework scores and average your 10 others. This homework is really just some questions off of H11 and H12 (or just like them). Be careful, only 5 questions here (20 points each). When 0 . 53 g of compound X is burned com- pletely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0 . 375 C is observed. What is Δ U rxn for the combustion of compound X? The hardware component of the calorimeter has a heat capacity of 3 . 6 kJ/ C. The specific heat of water is 4.184 J/g · C, and the MW of X is 56.0 g/mol. Correct answer: - 639 . 985 kJ / mol. Explanation: m X = 0 . 53 g MW X = 56.0 g/mol m water = 3000 g Δ T = 0 . 375 C C s = 4.184 J/g · C HC = 3 . 6 kJ/ C q cal = q water + q hardware q cal = C s · m water · Δ T + C hardware · Δ T Then divide the heat by the number of moles, which is mass/MW. Also remember that because the temperature increased in the calorimeter, the reaction must be exothermic and the value of q (and therefore Δ E ) is neg- ative.

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H13- extra edition-solutions - marquez(ecm739 H13 extra...

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