Problem 10: In some countries, liquid nitrogen 1s used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 175 L of liquid nitrogen, which has a density of 808 kg/m³. Part (a) Calculate the heat transfer, in kilocalories, necessary to evaporate this amount of liquid nitrogen and raise its temperature from its boiling point of -195.8 °C to 3.00°C. This value is the amount of cooling the liquid nitrogen supplies. The latent heat of vaporization for liquid nitrogen is Ly = 48.0 kcal/kg and the specific heat for gaseous nitrogen is 0.248 kcal/(kg-°C). Q = Part (b) What is this heat transfer, in kilowatt-hours? Part (c) For comparison, how much heat transfer, in kilocalories, would be needed to melt an identical mass of ice at 0°C? The latent heat of fusion for water is Lf= 79.8 kcal/kg.

Problem 10: In some countries, liquid nitrogen 1s used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 175 L of liquid nitrogen, which has a density of 808 kg/m³. Part (a) Calculate the heat transfer, in kilocalories, necessary to evaporate this amount of liquid nitrogen and raise its temperature from its boiling point of -195.8 °C to 3.00°C. This value is the amount of cooling the liquid nitrogen supplies. The latent heat of vaporization for liquid nitrogen is Ly = 48.0 kcal/kg and the specific heat for gaseous nitrogen is 0.248 kcal/(kg-°C). Q = Part (b) What is this heat transfer, in kilowatt-hours? Part (c) For comparison, how much heat transfer, in kilocalories, would be needed to melt an identical mass of ice at 0°C? The latent heat of fusion for water is Lf= 79.8 kcal/kg.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Energy transfer

The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.

Molar Specific Heat

Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)

Thermal Properties of Matter

Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.

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Problem 10: In some countries, liquid nitrogen 1s used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 175 L of
liquid nitrogen, which has a density of 808 kg/m³.
Part (a) Calculate the heat transfer, in kilocalories, necessary to evaporate this amount of liquid nitrogen and raise its temperature from its boiling
point of -195.8 °C to 3.00°C. This value is the amount of cooling the liquid nitrogen supplies. The latent heat of vaporization for liquid nitrogen is Ly = 48.0
'kcal/kg and the specific heat for gaseous nitrogen is 0.248 kcal/(kg-°C).
Q =
Part (b) What is this heat transfer, in kilowatt-hours?
Part (c) For comparison, how much heat transfer, in kilocalories, would be needed to melt an identical mass of ice at 0°C? The latent heat of
fusion for water is Lf= 79.8 kcal/kg.

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