Question

Use the thermodynamic data provided below to determine ΔG (in kJ/mol) for the condensation of C2H5OH...

Use the thermodynamic data provided below to determine ΔG (in kJ/mol) for the condensation of C2H5OH at 64.02 °C if the initial partial pressure of C2H5OH is 1.99 atm. Report your answer to one decimal place in standard notation (i.e. 123.4 kJ/mol).

Substance ΔH°f (kJ/mol) S° (J mol-1K-1)
C2H5OH (l) -277.7 160.7
C2H5OH (g) -235.1 282.7
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Answer #1

For C2H5OH (l)

G = H - TS

G = -277.7 kJ/mol - 337.02 (0.1607kJ mol-1K-1)

G = -331.85 kJ mol-1

For C2H5OH (g)

G = H - TS

G = -235.1 kJ mol-1- 337.02 (0.2827kJ mol-1K-1)

G = -330.375 kJ mol-1

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