Heat Essay

639 Words Jun 16th, 2014 3 Pages
Heat of Fusion of Water

4-1: Heat of Fusion of Water

The molar heat of fusion for a substance, ∆Hfus, is the heat required to transform one mole of the substance from the solid phase into the liquid phase. In this assignment, you will use a simple coffee cup calorimeter and a thermometer to measure the molar heat of fusion for water.

1. Start Virtual ChemLab, select Colligative Properties, and then select Heat of Fusion of Water from the list of assignments. The lab will open in the Calorimetry laboratory with a beaker of ice on the balance and a coffee cup calorimeter on the lab bench.

2. Click on the Lab Book to open it. Record the mass of the ice on the balance in the data table. If
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If you want to repeat the experiment, click on the red disposal bucket to clear the lab, click on the Stockroom, click on the clipboard, and select Preset Experiment #3, Heat of Fusion of Water.

Data Table
|volume of water in calorimeter (mL) | |
|mass of water in calorimeter (g) | |
|mass of ice (g) | |
|initial temperature ( C) | |
|final temperature ( C) | |

6. Calculate ∆T for the water using ∆T = |Tf – Ti|.

7. Calculate the heat (q) transferred, in kJ, from the water to the ice using q = mH CH∆T where the heat capacity (C) for water is 4.18 J/K∙ g and the mass, m, is for the water in the calorimeter.

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Virtual ChemLab: General Chemistry, Student Lab Manual/Workbook, v4.5, Third Edition, by Brian F. Woodfield and Matthew C. Asplund. Published by Prentice Hall. Copyright © 2013 by Pearson Education, Inc. Colligative

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