To determine the specific heat of an object, a student heats it to 100 ?C in boi
ID: 1313774 • Letter: T
Question
To determine the specific heat of an object, a student heats it to 100 ?C in boiling water. She then places the 69.9g object in a 161g aluminum calorimeter containing 128g of water. The aluminum and water are initially at a temperature of 19.3?, and are thermally insulated from their surroundings.
A. If the final temperature is 22.4 degrees, what is the specific heat of the object? Co_b= ? J/(kg x K)
B. Referring to the table, identify the material in the object.
Beryllium
Aluminum
Glass
Silicon
Iron (steel)
Copper
Silver
Gold
Lead
Substance Specific heat,J/(kg?K) Water 4186 Beryllium 1820 Aluminum 900 Glass 837 Silicon 703 Iron (steel) 448 Copper 387 Silver 234 Gold 129 Lead 128
Explanation / Answer
Q object + Q aluminum + Q water = 0
Q = m c dT
69.9*c*(22.4 -100) + 161*900*(22.4 - 19.3) + 128*4186*(22.4-19.3)=0
c=389
b) Copper
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