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q5f10 - Version PREVIEW Quiz 5 JOHNSON(53140 This print-out...

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Version PREVIEW – Quiz 5 – JOHNSON – (53140) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. LDE Bomb Calorimeter 006 001 10.0 points Assuming the apparatus itself absorbs no heat, what will be the change in temperature if 1000 mL of water are used as a heat sink for a reaction that releases 8 kJ of heat? 1. 1.91 K correct 2. 8.00 K 3. -271.09 C 4. -265 C 5. -1.91 K Explanation: q = m · c · Δ T 8 , 000 J = (1000 g) · (4 . 184 J g · K ) · Δ T Δ T = 1 . 91 K LDE Hess’ Law 006 002 10.0 points Calculate the change in enthalpy for the combustion of graphite using the data below. H 2 (g) + 1 2 O 2 (g) ←→ H 2 O(l) ΔH = - 285 . 83 kJ · mol 1 CO 2 (g) + 2H 2 O(l) ←→ CH 4 (g) + 2O 2 (g) ΔH = 882 . 00 kJ · mol 1 C graphite (s) + 2H 2 (g) ←→ CH 4 (g) ΔH = - 74 . 87 kJ · mol 1 C graphite (s) + O 2 (g) ←→ CO 2 (g) ΔH = ? 1. - 230 . 04 kJ · mol 1 2. 521 . 30 kJ · mol 1 3. - 515 . 87 kJ · mol 1 4. - 386 . 41 kJ · mol 1 correct 5. 235 . 47 kJ · mol 1 Explanation:

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