Question

Suppose the latent heat of vaporization of water is 540 cal/g. how much heat (in calories) must be added to 50 grams of water at an initial temperature of 20 C ( C represent degree Celsius) to a. heat it to the boiling point?

b. then completely convert the water to steam?

Answer #1

First we will Heat given to 50g of water to reach to 100
^{o}C.

Here,

m= 50g

S for water = 1 cal/gram ^{o}C

Second We have to find required to convert water into steam

L_{v} is latent heat of vapourization =540 cal/g

So, 31000 cal of energy is required to finally convert 50g of water into steam.

suppose the specific heat of ice and water is 0.49 cal/g. C ( C
represent degree Celsius) and 1.0 cal/g. C. the latent heat of
fusion of water is 80 cal/g. how much heat (in calories) is
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to a. raise the ice's temperature to the melting point? b. then
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How much heat must be added to 100 g of water at an initial
temperature of 50oC to completely evaporate it? Specific
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2. Sixty grams of water is at an initial temperature of 24
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Calculate the heat required to completely convert the 100 ºC
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cal/g.)
The heat required to completely convert the 100 ºC water to
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The heat of fusion of water is 79.9 cal/g, the heat of
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The
latent heat of vaporization (Lv) is similar to the latent heat of
fusion (Lf), except that it relates to boiling rather than melting.
For water Lv = 2.26 x 10^6 J/kg. .970 kg of steam at 100 degrees
celsius (the boiling point of water) is put in contact with a 13.5
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The latent heat of vaporization (Lv) is similar to
the latent heat of fusion (Lf), except that it relates
to boiling rather than melting. For water, Lv = 2.26 x
106 J/kg. .970 kg of steam at 100°C (the boiling point
of water) is put in contact with a 13.5 kg piece of metal. The
initial temperature of the piece of metal is 70.0°C. When the piece
of metal reaches 100°C, .0420 kg of steam has condensed.
a. How
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The latent heat of vaporization (Lv) is similar to
the latent heat of fusion (Lf), except that it relates
to boiling rather than melting. For water, Lv = 2.26 x
106 J/kg. .970 kg of steam at 100°C (the boiling point
of water) is put in contact with a 13.5 kg piece of metal. The
initial temperature of the piece of metal is 70.0°C. When the piece
of metal reaches 100°C, .0420 kg of steam has condensed.
a. How
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_________ cal
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