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LAB 3: Calorimetry and Specific Heat
Example for Part A Food Calorimetry
Identity of Food
marshmellow
mass of food before burning
0.75
mass of empty beaker
100.25 g
mass of beaker + water
205.75g
initial temp of water
21.2 oC
final temp of water
24.5 oC
mass of food after burning
0.41 g
Example for Part A Calculation
mass of water (mw)
4-3
mass of food burned (Mfood)
2-7
temp change of water (DTw)
6-5
calories gained by water (qw)
(105.50g)*1.00 cal/g oC *(3.3 oC)
calories lost by food (qfood)
11 = 12
joules gained by water (qw)
11 * 4.184 joule/cal
joules lost by food (qfood)
13
energy content per gram of food in calories
16 energy content per gram of food in joules
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13
105.50 g
0.34 g
3.3 oC
348.15 cal
348.15 cal
1,457 joule
1,457 joule
348.15 cal/0.34
1024 cal/g
1457 joule/0.34 g
4285 joule/g
Part B: Determination of Specific Heat
Example for Part B DATA
ID number of metal sample
assume "1"
mass of metal (mm)
20.52
mass of empty calorimeter
10.25 g
mass of calorimeter + water
105.75g
initial temp of calorimeter water
22.5 oC
temp of boiling water bath
98.5 oC
final temp of calorimeter water
35.8 oC
Example for Part B Calculations
mass of water in calorimeter(mw)
4-3
95.50 g
temp change of water (DTw)
7-5
13.3 oC
temp change of metal (DTm)
6-7
62.7 oC
Heat (joule) gained by water (qw)
(95.50g)*4.184 joule/g oC *(13.3 oC) 4117 joule
Heat (joule) lost by metal (qm)
12 = 11
4117 joule
Specific heat of metal (cm)
4117(joule)/(20.52 g)*(62.7 oC)
3.20 J/g oC