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Calculate the entropy change in surround...

Calculate the entropy change in surroundings when 1.00 mol of `H_(2) O_(l)` is formed under standard conditons `Delta_(f) H^(@) = - 286 K`.

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The standard enthalpof formation of water all 298 kj `mol^(-1) = - 286 kj mol^(-1)`
The reactions is exothermic so that heat is gained by surroundings.
`Delta H_("Sure")= 286.0 kj mol^(-1)`
= `286 xx 10^(3) j mol^(-1)`
`Delta S_("Sure") = (286 xx 10^(3)j)/(298 k) = 959.713 K^(-1)`
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