Question

# Use the thermodynamic data provided below to determine ΔG (in kJ/mol) for the vaporization of CaO...

Use the thermodynamic data provided below to determine ΔG (in kJ/mol) for the vaporization of CaO at 91.8 °C if the initial partial pressure of CaO is 1.76 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) CaO (l) -557.3 62.3 CaO (g) 43.9 219.7

For CaO (l)

G = H - TS

G = -557.3 kJ/mol - 364.95 (0.0623kJ mol-1K-1)

G = -580.36 kJ mol-1

For CaO (l)

G = H - TS

G = 43.9 kJ mol-1- 364.95 (0.219.7kJ mol-1K-1)

G = 43.9 - 80.18

G = 36.28 kJ mol-1

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