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Explain your answer. Internal Energy (U); Enthalpy (H); Helmholtz Free Energy (A or F); Gibbs Free...

Explain your answer.

Internal Energy (U); Enthalpy (H); Helmholtz Free Energy (A or F); Gibbs Free Energy (G),
which one is most appropriate for a problem on
a) Explosions
b) Skin Permeation of Chemicals
c) Rubber Elasticity
d) Distillation Columns

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