Experiment #06 Thermochemistry and Hess's Law

Experiment #06 Thermochemistry and Hess's Law - Temp (oC)...

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Experiment 6 Thermochemistry and Hess's Law Part 1: Calculate the Heat Capacity of the Calorimeter Data: 19.20 68.20 Instant. temp after mixing 42.13 Temperatures After mixing Time(sec) 20 42 40 41.7 60 41.4 80 41.2 100 41 120 40.8 140 40.6 160 40.4 180 40.2 Calculations: 44 Heat lost by water -659 J Heat gained by calorimeter 659 J Heat capacity of calorimeter 28.7 Part 2: Calculate change in Enthalpy for Each Reaction Time HCl + (sec) NaOH NaOH HCl 22.91 22.91 22.88 20 34.78 24.12 33.07 40 35.32 24.14 32.97 60 35.19 24.14 32.92 80 35.18 24.12 32.87 100 35.02 24.12 32.86 120 34.89 24.12 32.82 140 34.81 24.11 32.77 160 34.72 24.09 32.75 180 34.66 24.09 32.71 35.23 24.14 33.06 Cool H 2 O temperature o C Warm H 2 O temperature o C o C Temp ( o C) T avg of hot and cold o C J/ o C NH 4 Cl + NH 3 + T initial T instant 0 20 40 60 80 100 120 140 160 180 200 39.0 39.5 40.0 40.5 41.0 41.5 42.0 42.5 f(x) = -0.01x + 42.13 R² = 0.99 Temp. vs Time after Mixing Time(sec)
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Unformatted text preview: Temp (oC) Calculations: Heat Evolved kJ kJ/mol HCl + NaOH-5.66-56.6-0.57-5.7-4.68-46.8 Verify Hess's Law (1) - (2)-51.0 kJ/mol (3)-46.8 kJ/mol % Error 8.85 % NH 4 Cl + NaOH NH 3 + HCl (1) H + + OH---> H 2 O (2) NH 4 + + OH----> NH 3 + H 2 O (3) NH 3 + H +--> NH 4 + 20 40 60 80 100 120 140 160 180 34.2 34.4 34.6 34.8 35.0 35.2 35.4 f(x) = 0x + 35.23 R = 0.42 HCl + NaOH vs Time Time (sec) Temp (oC) 20 40 60 80 100 120 140 160 180 24.06 24.08 24.10 24.12 24.14 f(x) = 0x + 24.14 R = 0.7 NH4Cl + NaOH vs Time Time (sec) 20 40 60 80 100 120 140 160 180 32.5 32.6 32.7 32.8 32.9 33.0 33.1 f(x) = 0x + 33.06 R = 0.96 NH3 + HCl vs Time Time (sec) 200 200 200...
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Experiment #06 Thermochemistry and Hess's Law - Temp (oC)...

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