lab 6 - Experiment 6 The Latent Heat of Liquid Nitrogen...

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Experiment 6: The Latent Heat of Liquid Nitrogen Abstract: In this lab we measured the latent heat of vaporization for liquid nitrogen, which is the heat energy required to change liquid nitrogen to the gas phase. We put energy into the liquid through a resistor, which converted electrical energy into heat. We experimented with how long it took for the liquid to evaporate both with and without a heater, and from these values—along with the voltage and current—were able to calculate the latent heat of vaporization for liquid nitrogen. Questions: 1. The latent heat of vaporization is the extra energy required to pull the molecules apart when a substance is changing from a liquid to a gas. More specifically, it is the heat required to convert one gram of liquid to one gram of gas. During the time that it takes to convert a liquid to a gas, the temperature remains constant despite the added heat energy. 2. If we had used water instead of liquid nitrogen in this experiment, we probably would have had to use a higher voltage and current because it takes so much longer to get water up to the temperature at which it boils, and therefore turns to gas, than it takes for liquid nitrogen to reach that point. 3.a. If a substance has a latent heat of vaporization of 500J/g, 5000J of energy is required to evaporate 10 grams of the substance. This can be found by multiplying 10 grams by 500
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This note was uploaded on 11/17/2011 for the course PHYSIC 133 taught by Professor Staff during the Fall '10 term at UMass (Amherst).

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lab 6 - Experiment 6 The Latent Heat of Liquid Nitrogen...

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