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Chem152_Thermo1_Report

# Chem152_Thermo1_Report - NAME and ID Number Sienna Hiebert...

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NAME and ID Number: Sienna Hiebert 0725998 LAB PARTNER: Kaytlin Hopkins Quiz Section: Total Points = 60 pts PURPOSE AND METHOD DATA AND CALCULATIONS A: HEAT CAPACITY OF THE CALORIMETER Run 1 Run 2 Run 3 Voltage, V (J/C) 3.5 3.5 3.5 Current, A (C/s) 2.52 2.48 2.56 Time (s) 138.33 131.49 149.79 22.7 23.3 23.9 27.2 27.7 29.1 *Eletrical power input into calorimeter (q), J 1220.07 1141.33 1342.12 5 pts 271.13 259.39 258.1 262.87 Standard Dev 7.18 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 STD = 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) To determine the heat capacity of the calorimeter we calculated the change in temperature as a known amount of heat was added to the liquid. We used the set voltage, current and time it took to increase this calculated temperature. The heat lost to the room is minimized by the glass wool surrounding the container. We caclulated the Calorimeter constant by the following equations: Engergy = Current x Voltage x Time. And Ccal = energy / Change in Tempurature. We will now use this constant in the following experiements as well. ii) To measure the heat of fusion (this is some complicated chemistry were dealing with here so pay close attention) we will watch ice melt!!!! While doing this we will want to know the mass of ice and the change in temperature of the water that the ice is put in. The system is absorbing energy from the surroundings.

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