Question

At equilibrium, the free energy change, ΔG, of any system is zero: ΔG=0=ΔH−TΔS So, under equilibrium conditions, this equation can be rearranged as T=ΔHΔS

Part A

Glacial acetic acid is the concentrated form of acetic acid, the acid in vinegar. The term "glacial" refers to the appearance of the solid form, which resembles glacial ice. What is the melting point of this compound, in degrees Celsius, based on its thermodynamic data shown here?

ΔHfus (kJ/mol) = 24.32

ΔSfus [J/(K⋅mol)] = 83.93

Part B

Based on the following thermodynamic data, calculate the boiling point of ethanol in degrees Celsius.

Substance	ΔH∘f (kJ/mol)	S∘f [J/(K⋅mol)]
C2H5OH(l)	−277.7	160.6
C2H5OH(g)	−235.1	282.6

Answer 1

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