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9.0 g of H2 O is vaporized at 100^@C and...

9.0 g of `H_2 O` is vaporized at `100^@`C and 1 atm pressure. If the latent heat of vaporization of water is x J/g , then `Delta S` is given by ______ .

A

`(x)/(373)`

B

`(18x)/(100)`

C

`(18x)/(373)`

D

`(1)/(2) xx (18x)/(373)`

Text Solution

Verified by Experts

The correct Answer is:
D
`Delta S_("vaporisation") = (Delta H_("vapourisation"))/(T_(b))`
entropy change for conversion of 1 mol i.e. 9g `H_(2)O` of liquid into vapour at 373K is `Delta S_("vapourisation")` i.e. `(x)/(373)`
So, entropy change for .5 mole is `(1)/(2) xx (18x)/(373)`
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