(Answered) My approach to this was deltag deltah-tdeltas but i couldnt

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My approach to this was deltaG= deltaH-TdeltaS. But I couldn't find delta delta f G for liquid N. Is it safe to assume that its zero?

Liquid nitrogen freezes to a white solid at -210.00°C, with an enthalpy of fusion of 0.71 kJ/mol. What is its entropy of fusion? Is freezing biological tissue in liquid nitrogen an example of a reversible process or an irreversible process?

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