Compare the heat needed in taking 1 kg of gold from 25° C to 2700° C to taking 1 kg water from (– 30° C) to 1000° C. Which is more and why? There is: Q = m Lv (vaporizing/condensing) Q = m Lf (melting/freezing) -Please workout the problem on a piece of paper so it will be easier to understand.
Compare the heat needed in taking 1 kg of gold from 25° C to 2700° C to taking 1 kg water from (– 30° C) to 1000° C. Which is more and why? There is: Q = m Lv (vaporizing/condensing) Q = m Lf (melting/freezing) -Please workout the problem on a piece of paper so it will be easier to understand.
Chapter1: Temperature And Heat
Section: Chapter Questions
Problem 12CQ: Describe a situation in which heat transfer occurs.
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Compare the heat needed in taking 1 kg of gold from 25° C to 2700° C to taking 1 kg water from (– 30° C) to 1000° C. Which is more and why?
There is:
Q = m Lv (vaporizing/condensing)
Q = m Lf (melting/freezing)
-Please workout the problem on a piece of paper so it will be easier to understand.
Transcribed Image Text:Lv
Substance
Melting point ("C)
kl/kg kcal/kg
Boiling point (C)
kJ/kg kcal/kg
Helium
-269.7
5.23
1.25
-268.9
20.9
4.99
Hydrogen
-259.3
58.6
14.0
-252.9
452
108
Table 14.2 Heats of Fusion and Vaporization:
hapter 14. Heat and Heat Transfer Methods
L
Lv
Nitrogen
-210.0
25.5
6.09
-195.8
201
48.0
Oxygen
-218.8
13.8
3.30
-183.0
213
50.9
Ethanol
114
104
24.9
78.3
854
204
Ammonia
-75
108
-33.4
1370
327
Mercury
-38.9
11.8
2.82
357
274
65.0
Water
0.00
334
79.8
100.0
2256
539
Sulfur
119
38.1
9.10
444 6
326
77.9
Lead
327
24.5
S.85
1750
871
208
Antimony
631
165
39-4
1440
561
134
Aluminum
660
380
90
2450
11400
2720
Silver
961
88.3
21.1
2193
2336
ss8
Gold
1063
64.5
AS.4
2660
1578
377
Transcribed Image Text:Substances
Specific heat ()
Solids
1/kg-°C
kcal/kg "C
Aluminum
900
0.215
Asbestos
800
0.19
Concrete, granite (average)
840
0.20
Сopper
387
0.0924
Glass
840
0.20
Gold
129
0.0308
Human body (average at 37 °C)
3500
0.83
Ice (average, -50°C to o°C)
2090
0.50
Iron, steel
452
0.108
Lead
128
0.0305
Silver
235
0.0562
Wood
1700
0.4
Liquids
Benzene
1740
0.415
Ethanol
2450
0.586
Glycerin
2410
0.576
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