1.

find out the entroupy change in surroundings when 1 mole of H_(2)O(l)is fromed under standard conditionsDelta_(f)H^(-)=286kJmol^(-1)

Answer»

` 959.7 JK^(-1) mol^(-1)`
` 286JK^(-1) mol^(-1)`
` -959.7 JK^(-1) mol^(-1)`
` -286JK^(-1) mol^(-1)`

Solution :`H_(2)(g)+1/2O_(2)(g)toH_(2)O(l)`
` Delta_(r)H^(Theta)=-286kJ mol^(-1)`
when 1 mole of ` H_(2)O(l)` is formed, 286 kJ of heat is released. This heat is ABSORBED by the surrounding .
`i.e.q_("SURR")= + 286 kJ mol ^(-1)`
`DeltaS=(q_(surr))/T=(286 kJ mol^(-1))/(298K)`
`=959.7 Jk^(-1)mol^(-1)`


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