countries, liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 150 L of liquid nitrogen, which has a density of 808 kg/m3. (a) Calculate the heat needed in kilocalorie

University Physics Volume 2
18th Edition
ISBN:9781938168161
Author:OpenStax
Publisher:OpenStax
Chapter3: The First Law Of Thermodynamics
Section: Chapter Questions
Problem 66P: One of a dilute diatomic gas occupying a volume of 10.00 L expands against a constant pressure 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 150 L of liquid nitrogen, which has a density of 808 kg/m3.
(a)
Calculate the heat needed in kilocalories to evaporate this amount of liquid nitrogen and raise its temperature to 3.50°C. (You must use cp, and you can assume it is constant over the temperature range.) This is the amount of cooling the liquid nitrogen supplies.
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