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# Exam - Exam#2 100 points total 1 During a hot day a section...

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Exam #2 100 points total 1. During a hot day a section of railroad track is observed to increase temperature from 50° to 110°C. The section of track is made of iron, and has a mass of 233 x 10 3 moles. If the specific heat of iron is 0.45 J g -1 K -1 , how much heat energy was absorbed by the section of track? (5 points) 2. 50 mls of an aqueous solution of NaOH and 100 mls of an aqueous solution of HCl are combined and allowed to react in a constant pressure calorimeter. The reaction generated 2.51 kJ of heat energy. Assuming the specific heat of water is 4.18 J g -1 K -1 and the density of water is 1.0g/ml, what will be the temperature change of the solution? (5 points) 3. Given the following information: C(s) + 2H 2 (g) + 1/2O 2 (g) -> CH 3 OH(l) H = -239 kJ C(s) + O 2 (g) -> CO 2 (g) H = -394 kJ H 2 (g) + 1/2O 2 (g) -> H 2 O(l) H = -286 kJ Calculate H for the combustion of 15 grams of methanol (10 points)

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4. From the information and results in question #3 draw an enthalpy diagram which shows
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Exam - Exam#2 100 points total 1 During a hot day a section...

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