# lab 4 - Calculations C pb =(m cal x c cal x ΔT cal m w x c...

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Brennan Woods Lab Report #4 PHYSICS 102L March 29, 2010 Objective: To determine the specific head capacity of lead by method of mixtures. Theory: The specific head capacity of substance is defined as the quantity of heat required to raise the temperature of 1gof substance by 1°C. The specific head capacity of lead will be determined by the method of mixtures. In this method, the heat given out by the hot metal is absorbed by a calorimeter and stirrer and water. The quantity of heat given out or absorbed is given by the formula Q=mcΔt, where ms is the mass of substance in g, c is its specific heat capacity, and T is the change in temperature in degree Celsius. Head given out by lead= head absorbed by a calorimeter/stirrer+ Head absorbed bt water M pb x C pb x ΔT pb= m cal x c ca l x ΔT cal +m w x c w x T w By determing the masses of metal (mpb) water (mw), and calorimeter with stirrer (mcal), and noting the final and initial temperatures, the specific heat of lead can be found from the equation.

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Unformatted text preview: Calculations C pb = (m cal x c cal x ΔT cal +m w x c w x T w ) / (m pb x ΔT pb ) {Specific head of water is 1.00g/°C, calorimeter/stirrer-.22 cal/g°c} C pb= (85g x .22 cal/g°C x 1.3°C + 177.5g x 1.00 cal/g°C x 1.3°C)/ (93g x 73.6°C)= .0373 Theoretical Value= .0305 Actual Value= .373 Percent Error: .037-.0305/.0305= 22.2950% Data: Lead Calorimeter/stirrer Water Mass (g) 93g 85g 177.5g Initital temperature (C°) 97°C 22.1°C 22.1°C Final Temperature (°C) 23.4°C 23.4°C 23.4°C ΔT (°C) 73.6°C 1.3°C 1.3°C Specfic heat (cal/g°C) .0373 cal/ g°C .22 cal/g°C 1.00 cal/g°C Conclusion: In conclusion after heating the 93grams cups of metal (lead) in a steam generator and heating it to 95-100°C the calorimeter/stirrers/and water absorbed the head. Based on the experimentation the specific heat of lead was .037 cal/ g°C meaning it takes this specific amount of heat to raise 1g of lead by 1°C. The experiment produced a percent error of 21.31%....
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lab 4 - Calculations C pb =(m cal x c cal x ΔT cal m w x c...

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