Question

(a) A freezer maintains an interior temperature inside of −18.0°C and has a coefficient of performance of 3.00. The freezer sits in a room with a temperature of 18.0°C. The freezer is able to completely convert 34.0 g of liquid water at 18.0°C to ice at −18.0°C in one minute. What input power (in watts) does the freezer require? (The specific heat of liquid water is 4.186 J/(g · °C), the specific heat of ice is 2.090 J/(g · °C), and the latent heat of fusion of water is 334 J/g.) Answer in W

(b)

**What If?** In reality, only part of the power
consumption of a freezer is used to make ice. The remainder is used
to maintain the temperature of the rest of the freezer. Suppose,
however, that 100% of a freezer's typical power consumption of 160
W is available to make ice. The freezer has the same coefficient of
performance as given above. How many grams per minute of water at
18.0°C could this freezer convert to ice at −18.0°C? Answer in
g/min

Answer #1

a) A freezer maintains an interior temperature inside of −12.0°C
and has a coefficient of performance of 3.00. The freezer sits in a
room with a temperature of 25.0°C. The freezer is able to
completely convert 28.0 g of liquid water at 25.0°C to ice at
−12.0°C in one minute. What input power (in watts) does the freezer
require? (The specific heat of liquid water is 4.186 J/(g · °C),
the specific heat of ice is 2.090 J/(g · °C),...

19.
(a)
A freezer maintains an interior temperature inside of −16.0°C
and has a coefficient of performance of 3.00. The freezer sits in a
room with a temperature of 15.0°C. The freezer is able to
completely convert 28.0 g of liquid water at 15.0°C to ice at
−16.0°C in one minute. What input power (in watts) does the
freezer require? (The specific heat of liquid water is
4.186 J/(g · °C), the specific heat of ice is 2.090 J/(g ·...

A freezer has a coefficient of performance of 2.60. The freezer
is to convert 1.86 kg of water at 26.0 ∘C to 1.86 kg of ice at
-5.00 ∘C in 1 hour.
a) What amount of heat must be removed from the water at 26.0 ∘C
to convert it to ice at -5.00 ∘C ?
b) How much electrical energy is consumed by the freezer during
this hour?
c) How much wasted heat is rejected to the room in which...

500g of water at temperature of 15°C is placed in a
freezer. The freezer has a power rating of 100W and is 80%
efficient.
1- Calculate the energy required to convert the water
into ice at a temperature of -20°C.
2- How much energy is removed every second from the air
in the freezer?
3- How long will it take the water to reach a
temperature of -20°C?
4- Explain the process that cools the air in the
freezer.
5-...

A container with 59 g of water at 23oC is placed in a
freezer. How much heat must be removed from the water to turn it to
ice at –9 oC? Ignore the heat capacity of the container.
Give your answer in kilo-joules (kJ) with 3 significant
figures.
Specific heat of ice: 2.090 J/g K
Specific heat of water: 4.186 J/g K
Latent heat of fusion for water: 333 J/g

1. You need design a freezer that will keep the temperature
inside a -5.0 C and will operate with a temperature inside at 5.0 C
and will operate in a room with a temperature of 22.0 C. The
freezer is to make 20.0 kg of ice at 0.0 C starting with water at
20.0 C. For water, the specific heat is 4190 J/kg-K, the heat of
fusion is 333 kj/kg.
a. How much energy must be removed from the water...

A (18) g ice cube at –15.0°C is placed in (126) g of water at
48.0 degreesC. Find the final temperature of the system when
equilibrium is reached. Ignore the heat capacity of the container
and assume this is in a calorimeter, i.e. the system is thermally
insulated from the surroundings. Give your answer in degreesC with
3 significant figures.
Specific heat of ice: 2.090 J/(g∙ oC)
Specific heat of water: 4.186 J/(g∙ oC)
Latent heat of fusion for water:...

Let A be the last two digits, let B be the last digit,
and let C be the sum of the last three digits of your
8-digit student ID. Example: for 20245347, A = 47, B = 7, and C =
14.
A container with (15.0 + A) g of water at (8.0 + C)
oC is placed in a freezer. How much heat must be removed
from the water to turn it to ice at –(5.0 + B) oC?...

How much heat energy, in kilojoules, is required to convert 46.0
g of ice at −18.0 ∘C to water at 25.0 ∘C ? Express your answer to
three significant figures and include the appropriate units.
The constants for H2O are shown here:
Specific heat of ice: sice=2.09 J/(g⋅∘C)
Specific heat of liquid water: swater=4.18 J/(g⋅∘C)
Enthalpy of fusion (H2O(s)→H2O(l)): ΔHfus=334 J/g
Enthalpy of vaporization (H2O(l)→H2O(g)): ΔHvap=2250
J/g

How much heat energy, in kilojoules, is required to convert 79.0
g of ice at −18.0 ∘C to water at 25.0 ∘C ? Express your answer to
three significant figures and include the appropriate units.
The constants for H2O are shown here:
Specific heat of ice: sice=2.09 J/(g⋅∘C)
Specific heat of liquid water: swater=4.18 J/(g⋅∘C)
Enthalpy of fusion (H2O(s)→H2O(l)): ΔHfus=334 J/g
Enthalpy of vaporization (H2O(l)→H2O(g)): ΔHvap=2250
J/g

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