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

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern