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lewismichelle11
03.11.2020 •
Chemistry
The heat of vaporization of a certain refrigerant is 162 J/g. Calculate the number of
kilograms of refrigerant that must be evaporated to freeze a tray of 16 one-ounce
(1 oz = 28 g) ice cubes starting with the water at 16°C.
Heat capacity (water) = 4.184 J/g °C
ΔHfusion (water) = 333 J/g
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Ответ:
We need 1.106 kilograms of refrigerant to freeze 16 one-ounce ice cubes.
Explanation:
According to the statement, the refrigerant must receive the heat released from water to create ice cubes. If we know that there is no heat nor mass interactions with surroundings and freezing process is steady, then we get the following model from First Law of Thermodynamics:
Where:
Please notice that refrigerant is only vaporized (latent), whereas water is cooled down and freezed (sensible + latent). Then, we expand the equation above by definitions of sensible and latent heat:
Where:
Then we clear the mass of the refrigerant within:
If we know that
,
,
,
,
and
, then the mass of the refrigerant is:
If we know that a kilogram equals 1000 grams, then we need 1.106 kilograms of refrigerant to freeze 16 one-ounce ice cubes.
Ответ:
The first one,The second one, The third one And the forth one
Step-by-step explanation:
I JUST TOLD THE TEST.