In some countries, liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 180 L of liquid nitrogen, which has a density of 808 kg/m³.

University Physics Volume 2
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Chapter2: The Kinetic Theory Of Gases
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Problem 81AP: One process for decaffeinating coffee uses carbon dioxide ( M=44.0 g/mol) at a molar density of...
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In some countries, liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 180 L of
liquid nitrogen, which has a density of 808 kg/m³.
D A 33% 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 = |
33% Part (b) What is this heat transfer, in kilowatt-hours?
33% 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.
Transcribed Image Text:In some countries, liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 180 L of liquid nitrogen, which has a density of 808 kg/m³. D A 33% 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 = | 33% Part (b) What is this heat transfer, in kilowatt-hours? 33% 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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