thermochemistry & Hess's Law

thermochemistry & Hess's Law - Thermochemistry & Hess's...

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Miranda Pryor Partner: Cassandra Pryor Lab Section: A4 4/10/07
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Introduction: The energy changes that occur during chemical reactions were observed. Half of the class measured enthalpy change when NaOH and HCl are mixed. The other half measured the enthalpy change when NH 3 and HCl are mixed. Then all groups measured the enthalpy change when NaOH and NH 4 Cl are mixed. The mean changes of enthalpy for the NaOH+Cl and NH 3 +HCl were calculated. These were then used along with Hess’s law to determine the expected value of enthalpy change if these reactions were combined. Procedure: The procedures were adapted from Lab Manual for General Chemistry 1310, by Hall & Wentworth pg. 125-140.
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Discussion/Conclusion: The experimental enthalpy change for NaOH+NHCl was found to be -1.5. Using the mean enthalpy changes to calculate the same value, the enthalpy change is found to be -4. This is because -62-(-58)=-4. Obviously, there is some error in calculations on my part.
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This lab report was uploaded on 04/07/2008 for the course CHEM 1310 taught by Professor Cox during the Spring '08 term at Georgia Institute of Technology.

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thermochemistry & Hess's Law - Thermochemistry & Hess's...

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