Name Pre-lab Preparation Sheet for Experiment #17: Specific Heat of Solids 1. Wh

Question

Name Pre-lab Preparation Sheet for Experiment #17: Specific Heat of Solids 1. What fundamental law of physics is the foundation of the method of mixtures? 2. How many calories of heat must be added to 100.0 g of steel to raise its temperature by 3. How many grams of water at 20.0° C are necessary to change 800 g of water at 90.0° C to 50.0° C by mixing the samples together? 4. If 200 g of steel at 220 C are added to 500 g of water at 10.0° C in an insulated cup of negligible mass, find the final temperature of the mixture. 5. If, instead of a cup, the process in question 4 took place in a 100 g copper calorimeter, what would the new final temperature be? (You can assume the water and calorimeter reached their own equilibrium at 10.0° C before the steel was added.)

Explanation / Answer

2.

Heat required = m*Cp*dT

given values are:

m = 100 gm

Cp = 0.115 cal/gm-C

dT = 150 C

So,

Q = 100*0.115*150 = 1725 cal

3.

Heat released by first smaple = heat gained by second smaple

m1*cw*dT1 = m2*cw*dT2

cw is same in both case so

m1*dT1 = m2*dT2

m1 = 800 gm

dT1 = 90 - 50 = 40 C

dT2 = 50 - 20 = 30 C

m2 = ?

800*40 = m2*30

m2 = 800*40/30 = 1066.67 gm

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