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Question

The specific heats of iodine vapour and solid are 0.031 cal K1g1 and 0.055 cal K1g1 respectively. If heat of sublimation of iodine is 24 cal/g at 200C, calculate 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 into I2 vapour
I2(s)I2(g) ΔH=24 cal/g at 200CΔCp=(Cp)I2(g)(Cp)I2(s)=0.0310.055=0.024 cal g1K1
From Kirchhoff's equation,
ΔH250ΔH200C=ΔCp(T250T200)ΔH250C=240.024(523473)=241.2=22.8 cal g1

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