sheam solozhno of waterlo weighing ow much re of the 1 g explain ergy

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Sheam
соложно
of waterlo
weighing
ow much
re of the
-1; g =
Explain
ergy.
6
heat
ondenses Q
5J kg 1
ecules
nt heat
ccuracy
n flask.
of the
ed and
specific
erature
latent
which
N₂
every
were no heat losses. (O. & C.)
being evaporated
latent heat of steam, assuming that there
°C
A
B
60-
C
D
O
5
10 15 20
time, min
Figure 25B
more curare so effent.
11 Describe, giving the necessary theory, how the specific latent heat of a liquid may
be determined by a method which involves a constant rate of evaporation. What
are the advantages of this method over a method of mixtures?
In calorimetry experiments, a cooling correction has to be applied for heat losses.
Explain how this is done in the experiment you describe.
Figure 25B shows a cooling curve for a substance which, starting as a liquid,
eventually solidifies. Explain the shape of the curve and use the following data to
obtain a value for the specific latent heat of fusion of the substance: room
temperature = 20°C, slope of tangent to curve when temperature is 70°C = 10 K min1
specific heat capacity of liquid = 2.0 × 103 J kg 1 K-1, mass of liquid = 1.50 x
10-2 kg. (You may assume that Newton's law of cooling holds.) (L.)
Specific loven heat of the absence
D. But D2 Wet heat los