Question

1. To what temperature will 8400 J of heat raise 3.0 kg of water
that is initially at 60.0^{o} C?

2. What is the specific heat of a metal substance if 139 kJ of
heat is needed to raise 5.3 kg of the metal from 19.0^{o} C
to 37.0^{o} C?

3. If an ideal refrigerator keeps its contents at
4.0^{o} C when the house temperature is 22^{o} C,
what is its coefficient of performance?

Answer #1

If 1495 J of heat is needed to raise the temperature of a 356 g
sample of a metal from 55.0°C to 66.0°C, what is the specific heat
capacity of the metal? ___J/g•°C
2.80 kJ of heat is added to a slug of gold and a separate 2.80
kJ of heat is added to a slug of lead. The heat capacity of the
gold slug is 337J/°C while the heat capacity of the lead slug is
545 J/°C. If the...

A substance has a melting point of 20°C and a heat of fusion of
2.6×104 J/kg. The boiling point is 150°C and the heat of
vaporization is 5.2×104 J/kg at a pressure of 1.0 atm. The specific
heats for the solid, liquid, and gaseous phases are 600 J/(kg·K),
1000 J/(kg·K), and 400 J/(kg·K), respectively. The quantity of heat
required to raise the temperature of 3.0 kg of the substance from
3°C to 118°C, at a pressure of 1.0 atm, is...

What is the maximal coefficient of performance of a refrigerator
which cools down 10 kg of water (and then ice) to -6?C. Upper heat
source of this refrigerator is surroundings at constant temperature
21?C. Initially water is in equilibrium with surroundings. What is
maximal coefficient of performance of heat pump operating in the
same configuration. Specific heat of water, specific heat of ice,
and latent heat of fusion are equal to 4.19KJ/kg/K, 2.1KJ/kg/K and
335 KJ/kg, respectively.

How much heat transfer (in kJ) is necessary to raise the
temperature of 0.766 kg of ice from 0ºC to 32.6ºC? The specific
heat of water is 4186 J/kgºC and the heat of fusion for water is
334 kJ/kg.

Specific heat is the heat necessary to raise the temperature of
1kg of a given material by 1∘C. This specific heat value varies by
material with metals having relatively low specific heat with
organic materials and water being very high. The specific heat of
mercury is 140 J/kg∘C and the specific heat of water is 4190
J/kg∘C.
Part A 106 J of heat energy are transferred to 26.5 g of
mercury. By how much does the temperature increase?
Part B...

1. The specific heat of iron metal is 0.450 J/g⋅K. How many J of
heat are necessary to raise the temperature of a 1.05 −kg block of
iron from 28.0 ∘Cto 85.0 ∘C?
2. A 1.80-g sample of phenol (C6H5OH) was burned in a bomb
calorimeter whose total heat capacity is 11.66 kJ/∘C. The
temperature of the calorimeter plus contents increased from
21.36∘Cto 26.37∘C.
A. Write a balanced chemical equation for the bomb calorimeter
reaction.
B. What is the heat...

How much heat transfer in kJ is necessary to raise the
temperature of a 0.347 kg piece of ice from -12.6ºC to 132.1ºC ,
including the energy needed for phase changes? (cice = 2090 J/kgºC,
cwater = 4186 J/kgºC, csteam = 1520 J/kg, Lvap = 2256 kJ/kg, and
Lfus = 334 kJ/kg)

What is the specific heat of a substance that takes 1.30 ✕ 104 J
of heat raise its temperature from 28.0°C to 49.0°C?

A certain refrigerator requires 35 J of work to remove 190 J of
heat from its interior.
(a) What is its coefficient of performance?
(b) How much heat is ejected to the surroundings at 16 °C?
J
(c) If the refrigerator cycle is reversible, what is the
temperature inside the refrigerator?
°C

A heat pump is used to keep a house warm at 22C.
∘C
A. How much work is required of the pump to deliver 2500 J of
heat into the house if the outdoor temperature is 0∘C . Assume a
COP of 3.0
B.How much work is required of the pump to deliver 2500 J of
heat into the house if the outdoor temperature is -15∘C ? Assume a
COP of 3.0
C. How much work is required of the...

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