CHEM107lab8

CHEM107lab8 - Change in Temp- 14.1 degrees Celsius Part C:...

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Paden Allen CHEM 107-513 11 November 2008 Chemistry 107 Lab Report #8: Calorimetry and Hess’ Law Summary The purpose of this lab was to determine the heat of reaction for the combustion of magnesium metal. An indirect method based on Hess’ Law was used due the difficulty in measuring the reaction’s heat through calorimetry. The magnesium was reacted with hydrochloric acid to make magnesium chloride and hydrogen gas. Then, we added magnesium oxide with hydrochloric acid to make magnesium chloride and water. Since the enthalpy change in water is constant, we could use the results to determine the heat of reaction for the magnesium combustion. Experimental Data Part A: Mass of Cup- 3.59g Mass of Cup with 40 mL of water-41.8g Mass of 40 mL of water- 38.21g Cold Temp-23.3 degrees Celsius Hot Temp-80 degrees Celsius End mass- 77.92g-41.8g=36.12g Part B: Mass of Acid- 53.61g-3.91g= 49.7g Mass of Ribbon- 0.1788g
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Unformatted text preview: Change in Temp- 14.1 degrees Celsius Part C: Mass of Power- 0.4 g Mass of Acid- 55.3g-3.91g= 51.39g Change in Temp- 2.0 degrees Celsius Part B &C: (Delta H*Molar Mass/Mass of Additive)*1 kJ/1000 J= delta H˚x Delta H˚1= -285.8 kJ/mol Delta H˚2= -573.283 kJ/mol Delta H˚3= -37.32 kJ/mol Due to the reactions, Reaction Heat of Magnesium: -324.803 J Conclusion The experiment was successful in determining the heat of reaction for the combustion of magnesium metal. However, a slight error did exist due to human error and faulty lab equipment. By using our understanding of Hess’ Law, we could rearrange the equations to find the value of the reaction to be -324.803 J. The negative sign indicates that the reaction is exothermic due to it giving off heat. Overall, the data provided a successful calculation of the heat from the magnesium combustion through Hess’ Law....
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This note was uploaded on 06/04/2010 for the course CHEM 107 taught by Professor Generalchemforeng during the Fall '07 term at Texas A&M.

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CHEM107lab8 - Change in Temp- 14.1 degrees Celsius Part C:...

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