1.

The heat of sublimation of iodine is 24"cal"g^(-1) at 50^(@)C. If specific heat of solid iodine and its vapour are 0.055 and 0.031"cal"g^(-1) respectively, the heat of sublimation of iodine at 100^(@)C is

Answer»

`22.8"CAL"g^(-1)`
`25.2"cal"g^(-1)`
`-22.8"cal"g^(-1)`
`-25.2"cal",g^(-1)`

Solution :`DletaH_(2)-DeltaH_(1)=DeltaC_(P)(T_(2)-T_(1))`
`DeltaH_(2)-24=(0.031-0.055)(100-50)`
`impliesDeltaH_(2)=22.8"CALG^(-1)`


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