Lab6 latent heat 
Hoang Ngo
Lab 6 report
Anita Dey Thursday 8am
Abstract: We recently performed a liquid nitrogen experiment in finding the Latent heat of the substance. We isolated two parts of the experiment in order to find out how much evaporation of the liquid nitrogen was from the surroundings B and how much evaporation from the electricity G.
1. When a substance is undergoing a phase transition, more heat (energy) is being added to the
Substance but its temperature (a way of measuring its energy) is not changing. Where does this
Energy go if it does not go into heating up the substance? If a substance is changing from a
Solid to a liquid is it absorbing or emitting heat? How about from a gas to a liquid? (2 pt)
When a substance is undergoing a phase change but the temperature stays the same the energy is in the form of latent hear of fusion (melting) or latent heat of vaporization. If a substance is changing from solid to liquid then it absorbs heat from the surroundings in order to melt breaking the bonds that hold the molecules together. Gas to liquid is condensation which heat is emitting out of the substance and being removed.
2. A scientist heats up a substance by applying heat at a constant rate of 75 J/s. She measures that it takes 1 minute for 100 grams of the substance to evaporate. What is the latent of vaporization of this substance? If she starts with 1 kg of the substance, how long will it take for it to evaporate and how much energy will it take to evaporate the substance? (2 pt)
The latent heat of the substance is 75(60) = 4500. E=mL, 4500=(.1kg)L then L=45000 and if it takes 1 min to vaporize 100grams then it should take 10 minutes to vaporize about 1 kg of the substance.
3. Repeat the calculations for question 2, but now for a substance that takes an hour for 1 kg to
Evaporate. Which of these substance would be the best for the experiment performed in lab. (1.5 pt) 75(3600)=270,000. E=mL, 270000=(.1kg)L then L= 2,700,000. The substance that
Lab 6 report
Anita Dey Thursday 8am
Abstract: We recently performed a liquid nitrogen experiment in finding the Latent heat of the substance. We isolated two parts of the experiment in order to find out how much evaporation of the liquid nitrogen was from the surroundings B and how much evaporation from the electricity G.
1. When a substance is undergoing a phase transition, more heat (energy) is being added to the
Substance but its temperature (a way of measuring its energy) is not changing. Where does this
Energy go if it does not go into heating up the substance? If a substance is changing from a
Solid to a liquid is it absorbing or emitting heat? How about from a gas to a liquid? (2 pt)
When a substance is undergoing a phase change but the temperature stays the same the energy is in the form of latent hear of fusion (melting) or latent heat of vaporization. If a substance is changing from solid to liquid then it absorbs heat from the surroundings in order to melt breaking the bonds that hold the molecules together. Gas to liquid is condensation which heat is emitting out of the substance and being removed.
2. A scientist heats up a substance by applying heat at a constant rate of 75 J/s. She measures that it takes 1 minute for 100 grams of the substance to evaporate. What is the latent of vaporization of this substance? If she starts with 1 kg of the substance, how long will it take for it to evaporate and how much energy will it take to evaporate the substance? (2 pt)
The latent heat of the substance is 75(60) = 4500. E=mL, 4500=(.1kg)L then L=45000 and if it takes 1 min to vaporize 100grams then it should take 10 minutes to vaporize about 1 kg of the substance.
3. Repeat the calculations for question 2, but now for a substance that takes an hour for 1 kg to
Evaporate. Which of these substance would be the best for the experiment performed in lab. (1.5 pt) 75(3600)=270,000. E=mL, 270000=(.1kg)L then L= 2,700,000. The substance that