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Lab3_Thermo1

# Lab3_Thermo1 - NAME and ID Number Kevin Stock 0760631 Quiz...

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NAME and ID Number: Kevin Stock 0760631 LAB PARTNER: Ben Spector Quiz Section: Total Points = 60 pts (5 notebook, 55 template) PURPOSE AND METHOD DATA AND CALCULATIONS A: HEAT CAPACITY OF THE CALORIMETER Run 1 Run 2 Run 3 Voltage, V (J/C) 6.1 5.9 5.9 Current, A (C/s) 2.6 2.52 2.54 Time (s) 98.87 106.37 107.19 22.2 21.3 22.2 26.6 25.6 26.6 *Eletrical power input into calorimeter (q), J 1568.08 1581.51 1606.35 356.38 367.79 365.08 5 pts 363.08 Standard Dev 5.96 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): There are four parts to this experiment. In part I, we determine the heat capacity of our calorimeter for use in the rest of the experiment. We will do this by measuring the temperature change when a known amount of energy is added by an electric current. C cal = q cal /(T f -T i ) = (C/s)*(J/C)*s/(T f -T i ) In part II we find the heat of fusion of ice. The heat lost by the calorimeter = heat to melt the ice + heat the melted water heat gained by ice/water = (m ice )(ΔH fusion ) + (m ice )(4.184 J/gC)(ΔT water that was ice ) In part III we find the heat of neutralization of HCl and NaOH, and of NaOH and CH3COOH. By measuring the heat released, we can determine how acid strength affects enthalpy of neutralization. In part IV we will measure the enthalpy of hydration of magnesium sulfate (MgSO4 (s)). We can't do this directly so we will measure ΔH for MgSO4 (s) --> [Mg]2+ (aq) + [SO4]2- (ΔH1) and [Mg]2+ (aq) + [SO4]2- (aq) + 7H2O --> MgSO4-7H2O (-ΔH2) Adding together yields MgSO4 + 7H2O --> MgSO4-7H2O ΔH1-ΔH2 = ΔHhyd EXPERIMENT 3: CALORIMETRY *Show an example of the calculations you are performing for q and Ccal. (May be neatly

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Lab3_Thermo1 - NAME and ID Number Kevin Stock 0760631 Quiz...

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