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Q.

The ΔGo for the freezing of H2O(l)   at  -23°C  is  -200 J/mol . And standard enthalpy of fusion of ice at this temperature is 5600 J/mol. Find entropy change of universe when 1 mol of water freezes at -23°C .

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answer is 0.8.

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Detailed Solution

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Ans: 4.55  ΔGsys°=ΔHsys°TΔSsys
 200J/mol=5600J/mol250K×ΔSsys°
 ΔSsys°=(5400250)Jmol1K1andΔSsurr°=(5600250)Jmol1K1
 ΔSuniv°=ΔSsys°+ΔSsurr°=200250Jmol1K1

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