Heat of Fusion (Hf)
Obj: Determine Hf of
Materials: ice at 0oC,
insulated cups, balance, thermometer
1. Fill the insulated cup with
exactly 100.0 mL H2O at approximately 350C
to 40oC. Record the mass of
the cup and water and the temperature to 0.1oC just before adding
the ice cube.
2. Add a "dry" ice cube at 0oC
to the cup; hold it submerged with another insulated cup; stir gently.
3. Avoid spilling water. Record the lowest temperature observed
and the final mass of the system.
4. Calculate the mass of the ice
1. Calculate the heat of fusion (Hf) of ice using the equation: (c of water is 4180 J/Kg oC)
mw c ΔT = mi Hf + mi
c ΔT where mi is the mass of the ice cube
(water) (ice) (ice water)
2. Determine the % error. What are some sources of error?
3. Define Hf.
4. Why was it desirable to use an
ice cube at 00C rather than at a temperature below zero Celsius?
5. Why did we start with water at
6. What laboratory conditions would be
ideal for performing this lab?
7. If an iceberg at 00C has a
mass of 200,000,000 kg, how much heat would be required to melt the entire iceberg
and raise the melt water to 8.00C?
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