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The reaction, H(2(g)) + 1/2O(2(g)) to H2...

The reaction, `H_(2(g)) + 1/2O_(2(g)) to H_2O_((l))`, is spontaneous. The `DeltaS^(@) = - 163.1 J mol^(-1) K^(-1)`. The absolute entropies of `H_(2(g)) and O_(2(g))` are `130.6 JK^(-1)mol^(-1)` and `205 JK^(-1) mol^(-1)` respectively. Calculate the absolute entropy of water. 

Text Solution

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Change in standard entropy,
`Delta S ^(@) = S _(H _(2 ) O _(t)) ^(@) - [ S _(H _(2)) ^(@) + (1)/(2) S _(O _(2)) ^(@) ]`
`1.63 1 J mol ^(-1) k ^(-1) = S _(H _(2) O (l))^(@) - [130.6 + (205)/(2)]`
Absolute entropy, of water `=69.9 JK ^(-1) mol ^(-1).`
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