Thermochemistry: an Ice Calorimeter Determination of Reaction Enthalpy Essay Example
Thermochemistry: An Ice Calorimeter Determination of Reaction Enthalpy
Heidi Moen
Chemistry 151 Lab Section No. 47905
09/02/2010
Instructor: John Weide
Abstract: In this experiment, an ice calorimeter was used to measure the energy transferred from a system to the surroundings in an isothermal heat transfer. By measuring the change in volume by milliliters before, during, and after a reaction of Sulfuric acid and Magnesium ribbon takes place in the calorimeter reaction test tube. Two trial experiments were preformed. The average of both trials was calculated to be -363.67 kJ/mol, which is compared to the theoretical yield of enthalpy change; -464.2 kJ/mol. Lab partner was John Grek. Results:
Table 1 Change in volume in calorimeter after adding magnesium ribbon to Sulfuric acid
Time (seconds) Milliliters 0 | 0. 79 | 60 | 0.73 | 120 | 0.57 | 180 | 0.46 | 240 | 0.39 | 300 | 0.345 | 360 | 0.315 | 420 | 0.299 | 480 | 0.28 | 540 | 0.27 | 600 | 0.265 | 660 | 0.26 |
Table 1 Change in volume in calorimeter after adding magnesium ribbon to Sulfuric acid
Time (seconds) Milliliters 0 | 0. 87 | 60 | 0.84 | 120 | 0.829 | 180 | 0.82 | 300 | 0.72 | 360 | 0.635 | 420 | 0.51 | 540 | 0.43 | 630 | 0.37 | 690 | 0.33 | 750 | 0.315 | 840 | 0.28 | 930990 | 0.270.26 |
Sample Calculations Calculations are given for the first addition of magnesium ribbon to H2SO4 0.82 ml – 0.32 ml x g/0.0911 ml x 333 J/g x 1/0.0049 x kJ/1000J = -372.99 kJ/mol With the same
Heidi Moen
Chemistry 151 Lab Section No. 47905
09/02/2010
Instructor: John Weide
Abstract: In this experiment, an ice calorimeter was used to measure the energy transferred from a system to the surroundings in an isothermal heat transfer. By measuring the change in volume by milliliters before, during, and after a reaction of Sulfuric acid and Magnesium ribbon takes place in the calorimeter reaction test tube. Two trial experiments were preformed. The average of both trials was calculated to be -363.67 kJ/mol, which is compared to the theoretical yield of enthalpy change; -464.2 kJ/mol. Lab partner was John Grek. Results:
Table 1 Change in volume in calorimeter after adding magnesium ribbon to Sulfuric acid
Time (seconds) Milliliters 0 | 0. 79 | 60 | 0.73 | 120 | 0.57 | 180 | 0.46 | 240 | 0.39 | 300 | 0.345 | 360 | 0.315 | 420 | 0.299 | 480 | 0.28 | 540 | 0.27 | 600 | 0.265 | 660 | 0.26 |
Table 1 Change in volume in calorimeter after adding magnesium ribbon to Sulfuric acid
Time (seconds) Milliliters 0 | 0. 87 | 60 | 0.84 | 120 | 0.829 | 180 | 0.82 | 300 | 0.72 | 360 | 0.635 | 420 | 0.51 | 540 | 0.43 | 630 | 0.37 | 690 | 0.33 | 750 | 0.315 | 840 | 0.28 | 930990 | 0.270.26 |
Sample Calculations Calculations are given for the first addition of magnesium ribbon to H2SO4 0.82 ml – 0.32 ml x g/0.0911 ml x 333 J/g x 1/0.0049 x kJ/1000J = -372.99 kJ/mol With the same