Sum08_EXP3_Prelab%20%26%20Postlab%20Answer%20Key%20WebCT_sb - CHEM 6BL PRELAB\/POSTLAB ANSWER KEY EXPERIMENT#3 THERMOCHEMISTRY PRELAB ANSWER KEY 1(0

Sum08_EXP3_Prelab%20%26%20Postlab%20Answer%20Key%20WebCT_sb...

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Dr. S. Berniolles, Page 1 of 1 CHEM 6BL PRELAB/POSTLAB ANSWER KEY EXPERIMENT #3: THERMOCHEMISTRY PRELAB ANSWER KEY: 1. (0 points) See MSDS Information 2. (2 points) T water for the cold water will be (slightly) smaller than it should be. The calculated c metal will be smaller than the actual value. The calculated molar mass will be larger than it actually is. 3. (2 points) C c = 8.78 J/K 4. (2 points) T final = 21.14ºC 5. (2 points) q total = 99.8 kJ 6. (2 points) y = -0.42(5) + 40.98. The answer is: T f = 38.9ºC POSTLAB ANSWER KEY: 1. (1 point) M = 114.5 g/mol The calculated molar mass is closest to Indium (In: element #49). 2. (1 point) 6.21 × (11.64 – 8.5278) = 19.3 (three sig. figs total) 3. (1 point) The temperature declines because heat is lost to the surrounding environment, through

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