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CHEMISTRY 161 Chapter 6

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As always… OWL Lon-Capa assignments Lecture videos Textbook Read

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As always… OWL Lon-Capa assignments Lecture videos Textbook Read Do text homework

Clicker Question Calculate E for a system that releases 28 J of heat while 63 J of work is done on it. a) -35 J b) -91 J c) 35 J d) 91 J

Clicker Question Use the following data for methanol (CH3OH): ΔHvaporization = 35.3 kJ/mol at 64.7°C Determine ΔE (kJ/mol) for methanol vaporizing at 64.7°C. a) 32.5 b) 35.3 c) –35.3 d) 38.1 e) –38.1

Determining Hrxn Since H = qp, determine the heat given off or required at constant pressure by measuring temperatures. This is termed calorimetry. Since energy is conserved, we can often determine Hrxn for one reaction given values of Hrxn for others. Uses the principle in Hess’s Law. Use standard enthalpies of formations for reactants and products (we have tables of these).

A Coffee-Cup Calorimeter Made of Two Styrofoam Cups

Bomb Calorimeter (constant V)

NH4NO3(s)  NH4+(aq) + NO3–(aq) ΔH = 25.7 kJ Clicker Question A 5.014-g sample of NH4NO3(s) is dissolved in 50.00 mL of water with both substances initially at room temperature (24.7°C). Calculate the final temperature of the solution. You may make the following assumptions: no heat loss to the surroundings; the specific heat capacity of the solution is 4.18 J/g°C; and the density of water is 1.00 g/mL. NH4NO3(s)  NH4+(aq) + NO3–(aq) ΔH = 25.7 kJ a) 17.0°C b) 17.7°C c) 31.7°C d) 32.4°C e) I cannot get any of these answers.