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Question

The specific heats of iodine vapour and solid are 0.031 and 0.055 cal K1 g1 respectively. If heat of sublimation of iodine is 24 cal g1 at 200oC, find its value at 250C.

A
5.7 cal g1
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B
11.4 cal g1
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C
22.8 cal g1
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D
45.6 cal g1
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Solution

The correct option is C 22.8 cal g1
Solid I2 is converted in I2 vapour,
The reaction will be,
I2(s)I2(g) H=24 cal g1 at 200oC

Cp=(Cp)product(Cp)reactant
Cp=(Cp)I2(g)(Cp)I2(s)
=0.0310.055=0.024 cal K1 g1

From Kirchhoff's equation
H250oCH200oC=Cp(T250oCT200oC)
putting the values,
H250oC=240.024(523473)
=241.2
H250oC=22.8 cal g1

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