Hess Law Lab

Purpose Measure the enthalpy for three reactions and to confirm the value of Hess fairness in predicting the ?H of a reaction A) NaOH(s) NaOH(aq) B) NaOH(aq) + HCl(aq) NaCl(aq) + H2(l) C) NaOH(s) + HCl(aq) NaCl(aq) + body of water(l) Materials Styrofoam Cup Calorimeter| Forceps| Thermometer| NaOH Pellets| gradatory cylinder| 0.50M HCL| Beaker| Magnetic scaremonger| Stirring Hot dental plate| | | | Procedure Thermometers were apply instead of lob pro. (Refer to lab handout) Observations spoil across mavin: Results for plane section A: foot race| fold m / g| Temperature of H2O (±0.1°C)| | Cups| Cups, H2O, Pellets| Cups, Pellets | scratch Ti / °C| final examination Tf / °C| change ?T / °C| 1| 7.14g| 56.15g| 8.15g| 19.3°C| 23.0°C| 3.7°C| 2| 7.49g| 55.17g| 8.48g| 19.4°C| 23.5°C| 4.1°C| 3| 8.02g| 54.15g| 9.03g| 19.4°C| 23.2°C| 3.8°C| Table twain: Results for Part B: foot race| Mass m / g| Temperature of H2O (±0.05°C)| Temperature of HCl (±0.1°C)| | Cups, H2O, Pellets| sign Ti / °C| final Tf / °C| Final Tf / °C| 1| 104.66g| 21.2°C| 21.1°C| 24.9°C| 2| 103.40g| 20.2°C| 22.3°C| 24.6°C| 3| 102.56g| 20.0°C| 22.1°C| 24.

7°C| Table Three: Results for Part C: struggle| Mass m / g| Temperature of H2O and HCl (±0.1°C)| | Cups| Cups, H2O, Pellets| Cups, H2O, Pellets| Initial Ti / °C| Final Tf / °C| Change ?T / °C| 1| 7.41g| 104.41g| 8.41g| 20.4°C| 23.9°C| 3.5°C| 2| 7.85g| 103.12g| 8.84g| 20.1°C| 25.0°C| 4.9°C| 3| 8.33g| 103.01g| 7.61g| 20.2°C| 24.2°C| 4.0°C| Analysis ingest Calculations: rill single: Part A * ?H=mH2OcH2O?tnNaOH * ?H=48.00g4.18Jg-1K-13.7K0.025mol * ?H=29694.72Jmol-1=29.69kJmol-1 experiment Calculation: Trial One: Part A: flaw * wrongdoing=mH2OcH2O?tnNaOH * Error=0.010.20.01 * Error=21%+5.4%+40%=66.4% * Error=19.72kJmol-1 Trial| Enthalpy ?H / kJmol-1| Trial One|...If you extremity to get a full essay, bless it on our website: Ordercustompaper.com

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