Question

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 How much heat is needed to raise the temperature of 26.5 g of water by the same amount?

Answer #1

1kg of methane is burned, and the heat is used to raise the
temperature of 50 kg of water. If the initial temperature of the
water is 25°C, what is the final temperature?

How much heat is required to change m=1kg of ice at
-6°C into water at 60°C? cw= 4190
J/kg*K (specific heat of water), Lf= 333 kJ/kg (latent
heat of fusion of ice), cice= 2100 J/kg*K

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 pressure cooker (steel, 1Kg, specific heat = 502 J/kgK) filled
with air (assume monoatomic ideal gas: V = 4 L, P=1 atm, T=25C) is
heated by 10 g of wood (heat of combustion = 21.2 MJ/Kg). Assume
all heat produced by combustion is transferred to the pot and that
the pot cannot dissipate heat. What is the final temperature of the
gas? Of the pot?

8.33 kg of steam at temperature of 150 ∘C has 2.23×107 J of heat
removed from it. Determine the final temperature and phase of the
result once the heat has been removed if the heat is removed at
constant pressure during the gas phase.
For this problem, use the specific heat (at constant pressure)
for water as 1850 J/kg∘C , the latent heat of vaporization as
2.256×106 J/kg , the specific heat of liquid water as 4186 J/kg∘C ,
the...

(a) How much energy does it take to heat 250 g of water from 20
◦C to the boiling point of 100 ◦C? (The specific heat of water is
4190 J/kg · K)
(b) (Suppose you wanted to cause the temperature change in part
(a) by using an 800W microwave. If we assume all the power
delivered by the microwave goes into the water, how long will it
take for the water to change temperature?
(c) The heat of vaporization...

(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.

4. In total, how much heat is required to raise the temperature
of a 450 g sample of water (c = 4.18 J/oC.g) in a saucepan that has
a heat capacity of 300 J/oC from 200C to 75oC?

8.33 kg of steam at temperature of 150 ∘C has 2.23×107 J of heat
removed from it. Determine the final temperature and phase of the
result once the heat has been removed if the heat is removed at
constant pressure during the gas phase. For this problem, use the
specific heat (at constant pressure) for water as 1850 J/kg∘C , the
latent heat of vaporization as 2.256×106 J/kg , the specific heat
of liquid water as 4186 J/kg∘C , the...

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