Combustion of Methane Lab Simulation
Note: Some people have had trouble with the Java applets so there are screen shots in the file listed below this one on the course page.
Also, a helpful student has included this after trouble shooting:
“I initially had some trouble with getting the Java-script simulations to load on my browser, and so I thought I would include some information on how to get them to work (on any windows operating system), because I found that being able to tweak the values in the simulations was very helpful.
This link shows you how to configure site exceptions for “untrustworthy” java applets.
Simply add the site exception to the list on your Java Configuration program, and this will allow your computer to load these older java applets.
I found also that when scrolling down on the page, the simulation would scroll out of the way. It helps to zoom in and out on the page to reset the ‘location’ of the java simulation display.”
Thanks so much!
*use Hess’ Law to rearrange the three reactions above to match the overall reaction. Do NOT worry about enthalpy values at this point, you will be finding them in the next steps*
b. Find the enthalpy of combustion of magnesium using Hess’ law given the following data (assume that exactly 100.0ml of HCl was used in each trial and that HCl is in excess).
Grams of Magnesium 0.244 g
Final Temperature 32.2oC
Initial Temperature 21.3oC
Magnesium Oxide/HCl Reaction
Grams of MgO 0.996 g
Final Temperature 28.8oC
Initial Temperature 21.4oC
c. The accepted theoretical value is -601.6kJ/mol. Find your percent error.
d. Explain 2 reasons why the calculated value from the experimental data may differ from the theoretical value for the heat of reaction above and how each reason would affect your experimental data (be specific).
e. Explain why the enthalpy of combustion for magnesium could not be measured using a coffee cup calorimeter.
**Note that an overall purpose is required, as are conclusions for Activity 1!**
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