Phys2Lab3 - Lv = We again filled the cup with 2/3 water and...

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Matthew Malek Lab Partners: Jon and Christina Lab #3 09/13/2006 Latent Heat of Fusion and Vaporization Objectives: To determine the number of calories to melt and to vaporize 1 gram of ice and water. Theory : The energy that goes into making molecular bonds break down without raising the temperature is called latent heat of fusion: m cup c cup Δ T w / m ice + m w c w Δ T w / m ice - m mi c mi Δ T mi /m ice = L f The energy needed to make molecules vibrate so fast that water becomes a vapour is the Latent heat of Vaporization m w c w Δ T w /m steam + m cup c cup Δ T w / m steam - m cs c w Δ T w / m steam = L v Procedure : Lf = Measure everything before and after you do anything. We filled a cup 2/3 of water, measured the temp. We then added about 50 grams of ice stirred and measured the temperature again at its lowest reading. Then we re weighed the cup with water and melted ice to find the mass. We did this about 4 times
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Unformatted text preview: Lv = We again filled the cup with 2/3 water and measured the temperature. This time we allowed steam to flow into the calorimeter cup for about 30 seconds. We then recorded the Peak temperature and did this about 4 or 5 times. We then filled out of data table and filled in our analysis table. Conclusion I feel that our data had a lot of flaws to it. Seeing how most of our percent errors were over 20%. This could be due to the way in which we used the instruments or outside factors that we did not account for. Over all it seems that our data for the latent heat of fusion was much more accurate then that of vaporization. Our lowest percent error for vaporization was 4.9% which isnt bad at all....
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