Question

(a) How much heat transfer is required to raise the temperature of a 0.750-kg copper pot containing 2.50 kg of water from 30.0ºC to the boiling point and then boil away 0.750 kg of water?

(b) How long does this take if the rate of heat transfer is 555 W 1 watt = 1 joule/second (1 W = 1 J/s) ? Answer in seconds.

Answer #1

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.550 kg aluminum pot containing 3.50 kg of water
from 25.0°C to the boiling point and then boil away 0.650 kg of
water?
(b)
How long (in s) does this take if the rate of heat transfer is
600 W (1 watt = 1 joule/second (1 W = 1 J/s))?

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.600 kg aluminum pot containing 2.00 kg of water
from 40.0°C to the boiling point and then boil away 0.850 kg of
water?
kcal
(b)
How long (in s) does this take if the rate of heat transfer is
600 W (1 watt = 1 joule/second (1 W = 1 J/s))?
s

(a)
How much heat transfer (in kcal) is required to raise the
temperature of a 0.700 kg aluminum pot containing 1.50 kg of water
from 35.0°C to the boiling point and then boil away 0.800 kg of
water?
? kcal
(b)
How long (in s) does this take if the rate of heat transfer is
550 W (1 watt = 1 joule/second (1 W = 1 J/s))?
? s
Please explain each step thoroughly and why, I am really
confused.

How long will it take 2kg of water to boil in a copper pot that
weight .650 kg Given that the stove can produce 1000 W? During the
boiling you can assume that 20% of the energy is lost. The initial
Temperature was 75 Kelvins.

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.

How much time (in seconds) is needed for a surgical cauterizer
to raise the temperature of 2.00 g of tissue from 37.0°C to 100°C
and then boil away 0.200 g of water, if it puts out 1.50 mA at 20.0
kV? Ignore heat transfer to the surroundings. (Assume the specific
heat of tissue is 3,500 J/(kg · °C) and the latent heat of
vaporization of water is 2,256 kJ/kg.)

(a) How much energy is needed to raise 1.00 kg of liquid water
from 19.9 ?C to 99.9 ?C? (b) How much energy is needed to evaporate
1.00 kg of liquid water (at 100?C) into steam (at 100?C)? Be
careful not to confuse J with kJ. (c) Is the relative size of these
two numbers consistent with everyday experience that it takes much
longer (e.g. maybe an hour or so) to boil away an entire pot of
water than it...

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)

A 7-kg cube of copper (cCu = 386 J/kg-K) has a
temperature of 750 K. It is dropped into a bucket containing 5.5 kg
of water (cwater = 4186 J/kg-K) with an initial
temperature of 293 K.
1)
What is the final temperature of the water-and-cube system?
K
2)
If the temperature of the copper was instead 1350 K, it would
cause the water to boil. How much liquid water (latent heat of
vaporization = 2.26

(a) How much heat is required to raise by 13.20°C the
temperature of 1.7 kg of water.
(b) How much heat is required to raise by 13.20°C the
temperature of 1.7 kg of iron.

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