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The specific heats of iodine vapour and ...

The specific heats of iodine vapour and solid are `0.031` and `0.055 cal//g` respectively. If heat of sublimation of iodinde is `24cal//g` at `200^(@)C`, what is its value at `250^(@)C` ?

A

22.8 cal/g

B

11.4 cal/g

C

29.4 cal/g

D

12.5 cal/g

Text Solution

Verified by Experts

`{:("Given : "I_(2)(s)rarrI_(2)(g),,,Delta H=24 "cal/g at" 200^(@)C),(" "Delta C_(P)(cal//g),=,C_(P)" of product "- C_(P)" of reactant"),(" "Delta C_(P)(cal//g),=,0.031-0.055),(" "Delta C_(P)(cal//g),=,-0.024 cal//g),("Now, "Delta H_(2)-Delta H_(1),=,Delta C_(P)(T_(2)-T_(1))),(" "Delta H_(2)-24,=,-0.024xx(523 - 473)),(" "Delta H_(2),=,24-1.2=22.8 cal//g):}`
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