Calorimetry Lab - Michelle Duan Thermochemistry lab Pre-Lab...

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Michelle Duan Thermochemistry lab Pre-Lab questions 1. It is the change in enthalpy of the reaction. 2. It is the amount of heat it takes to raise one mole of the substance by one degree Celsius. 3. (50x1.02)(3.9)(4.18) = -831.402 J/mol-k 4. -863.38 J/mol-k 5. .6(.025) = .015 mol AB -.863 = 0.015(delta H) delta(H) = 57.53 Data Tables Part 1 Data table. Determination of the Heat Capacity of the Calorimeter Initial temperature (degrees Celsius) 50.0 mL H 2 O – room temperature 22.0 50.0 mL H 2 O – heated 68.0 Mixing Data Time Temperature (degrees celcius) 20 41.9 40 41.7 60 41.5 80 41.4 100 41.3 120 41.2 140 41.1 160 41.0 180 40.9 T mix (Celsius) : 42 T avg (Celsius) : 45 Q cal’ J : -(50)(4.18)(42-45) = 627 J C cal’ JºC : 627/(41-22) = 31.35 J Part 2 Data Table. Determination of Heats of Reaction
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Michelle Duan Reaction 1: HCl + NaOH NaCl + H 2 O Initial temperature (ºC) 50 mL 2.0 M HCl : 21.5 50 mL 2.0 M NaOH : 21.2 Mixing Data Time (sec) Temperature (ºC) 20 32.8 40 33.1 60 33.3 80 33.4 100 33.5 120 33.6 140 33.6 160 33.6 180 33.6 T mix’ ºC : 32.2 Q rxn’ J : -((100(1.03)x4.18x(32.2-21.35) + 31.35(32.2-21.35)) = -5011.5 Detla H, kJ/mol : n(Detla H) = -5.011 kJ n = .1 Detla H = -50.11 kJ Reaction 2: NH 4 Cl + NaOH NH 3 + NaCl + H 2 O Initial temperature (ºC) 50.0 mL 2.0 M NH
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