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Final

Final Formal Lab 3 Experiment.docx

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Department
Chemistry
Course
CHM1311
Professor
A L L
Semester
Spring

Description
EnthalpyofVariousReactionsIntroduction In this lab we performed a number of experiments dealing with enthalpy which is part of Thermochemistry Thermochemistry is the study of heat and energy that is released or absorbed The SI unit used is Joules JSome basic instruments used to measure the enthalpy is a calorimeter A simple everyday example of a calorimeter would be a Styrofoam cup which would be used in this lab For this lab the calorimeter is used to measure the specific heat capacity and molar mass of a metal the enthalpy of neutralization of a strong acidbase and lastly the enthalpy of an unknown saltSpecific heat capacity is the quantity of heat required to change the temperature of a system by a degreeThe equation used to find this is qmCT where m is mass c is the heat gained or lost and T is the change in temperature In thermochemistry we have terms called the system and surrounding The Calorimeter would be considered the system in this case and anything around it would be considered the surrounded This means if heat enters the calorimeter q would be positive and if heat exits it q would be negative In other words when q is negative if heat leaves the calorimeter the reaction is exothermic If q is positive heat enters the calorimeter the reaction is endothermic This uses the equation qmetalqwater where the system loses heat the sign is negative and vise versa To determine more complex reaction we can use Hesss law This is where you have a bunch of different reactions and when you add them all up it gives you a chemical reaction and all the total enthalpy To determine Another equation that will be used in this lab is MM x c25 JmolC This equation is zincmetused when you know the specific heat capacity and want to know the molar mass This would guestimate your answer for you This equation and value of 25 JmolC was made by Dulong and Petit in 1819 They proposed that 1 mole of any metal is basically the same as 25J To find the total heat energy of neutralization you will need to use Hqn where q is NNXyour total energy of heat using qmcT divided by the mole of HO 2Reference httpwwwchemguidecoukphysicalenergeticsneutralisationhtmlJim Clark enthalpy change of neutralisation ProcedurePlease refer to the chemistry lab manual What in the World Isnt chemistry by Dr Rashmi Venkateswaran 2013 Experiment 3 Page 34 Data tablesResults
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