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# Chem 1311 lab expirement 3.docx

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School
University of Ottawa
Department
Chemistry
Course
CHM1311
Professor
A L L
Semester
Spring

Description
Introduction Enthalpy is described as a thermodynamic quantity that is the sum of the internal energy plus the product of the pressure and volume More closely it varies based on the energy released or added to one mole of a substance in its standard state Based on a positive or negative value of enthalpy H depicts the direction of energy flow in a closed system which describes whether a reaction is endothermic Energy gained or exothermic Energy lost In order to calculate this a calorimeter was used A calorimeter is a device used to measure the heat of a reaction Energy can then be calculated using the following equation EmcT Here m represents the mass of the substance c represents the specific heat capacity of that substance and T represents the change in temperature of the reacting substance If no energy is released into the environment the reacting substance must then be equal to the energy gained by the mass of the water of which the reaction is taking place The specific heat capacity is the amount of heat per unit mass required to raise the temperature by one degree Celsius Throughout the lab we will look at various reactions in order to determine the Specific Heat Capacity of a metal the Enthalpy of a Neutralization and Enthalpy of Dissolution of a Salt ProcedureRefer to lab manual Laboratory Manual for General Chemistry by Dr Rashmi VenkateswaranObservations Data and ResultsExperiment 1 Specific Heat Capacity of a MetalTrial 1Trial 2Mass of Zinc g11061243Mass of Calorimeter g012012Volume of Distilled water in 20002000Calorimeter mLMass of Calorimeter and 38403933Water gTemperature of Water in Calorimeter for 3 minutesTime s0306090120150180TemperatureTrial 1230230230230230230 230oCTrial 2233233233233233233233Temperature and Time of Metal in Calorimeter for 4 Minutes Every 20 seconds oTime sTemperature CTrial 1Trial 2023023320265273402652726026527280264272100264272120264272140264272
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