Specific Heat and Latent Heat of Fusion
Laboratory #7
Michael Dark
Section 106
Ashley Pearson
Wendy Huang
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View Full DocumentPurpose
The purpose of this lab was to determine the specific heat of brass and another
metal, and to measure the latent heat of fusion of ice, using a calorimeter.
We also
observed the temperature versus time behavior of a material that undergoes a phase
transition.
Theory
The total amount of heat that flows into an object is equal to
Q = c m
∆
T
Where c is the specific heat of the object, m is the mass of the object, and
∆
T is the
change in temperature.
If no heat is lost to the environment, then it is equivalent to
Q
metal
+ Q
water
+ Q
calorimeter
= 0
Where Q
metal
is the heat of the metal, Q
water
is the heat of the water, and Q
calorimeter
is the heat
of the calorimeter.
C
calorimeter
*m
calorimeter
= 63 J/
°
C
C
water
= 4186 J/kg
°
C
The amount of heat needed to melt an arbitrary mass of an object is equal to
Q
melt
= m
object
*
L
f
Where m is the mass of the object and L
f
is the latent heat of fusion.
Procedure
We began the experiment by weighing the dry empty calorimeter without the
thermometer and obtaining a mass of .2758 kg.
We then measured the mass of the brass
block and obtained a mass of .2519 kg.
We attempted to heat the brass block in boiling
water to 100
°
C but obtained only 99.2
°
C.
We left the block in the boiling water for five
minutes and filled the calorimeter with 100 cm
3
of water at 20
°
C.
We then measured the
mass of the filled calorimeter at .4269 kg and used this value along with the mass of the
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 Spring '07
 Cui
 Physics, Thermodynamics, Heat, Lf

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