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Chem152_Thermo1_Report

# Chem152_Thermo1_Report - NAME and ID Number Rebekah...

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NAME and ID Number: Rebekah Traficante 1706 LAB PARTNER: Lori Sekijima Quiz Section: AB Total Points = 60 pts Notebook: No points are specifically assigned to your notebook for this lab, however, your TA may deduct up to 5 points for notebook pages that are disorganized, difficult to read, or do not contain complete data and observations. PURPOSE AND METHOD DATA AND CALCULATIONS A: HEAT CAPACITY OF THE CALORIMETER Run 1 Run 2 Run 3 Voltage, V (J/C) 3.00 3.00 3.00 Current, A (C/s) 1.95 1.90 1.88 Time (s) 198.00 200.00 199.00 22.80 23.00 23.00 27.20 27.00 27.00 *Eletrical power input into calorimeter (q), J 1158.30 1140.00 1122.36 263.25 285.00 280.59 5 pts 276.28 Standard Dev 11.5 Help In Excel type "=average(range of values)" Instead of entering a range, just click at one end of the values and drag mouse to the other end For standard deviation, in Excel type "=stdev(range of values)". Initial temperature, o C Final temperature, o C *Calorimeter Constant, C cal, J/ o C Average, C cal Our goals are to: i) Determine the heat capacity of the calorimeter ii) Measure the heat of fusion of ice iii) Measure the heat of neautralization iv) Determine the enthalpy of hydration magnesium sulfate. Explain how each of these is accomplished in this experiment . (2 pts each = 8 pts): i)We will use the calorimeter and determine the change of temperature when a known amount of heat is added to the calorimeter containing a certian amount of water. Using the temperature values found we can determine the Ccal average and use the average for the rest of the experiment. ii) We will take a certain amount of water and measurethe intitial temperature and then put a cube of ice in the water and wait till it melts. When the ice has melted, we will record the final temperature. The calorimeter, stir bar, and water will be weighed before the ice was put in and then after the ice has melted.

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