The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be________________?
Correct answer: B. 3567Pa
- A. 3171Pa
- B. 3567Pa
- C. 1.01 x 10^5Pa
- D. 5000Pa
Explanation
Using the integrated Clausius–Clapeyron relation, ln(f₂/f₁) = ΔHvap/R(1/T₁ − 1/T₂), raises the fugacity from about 3171 Pa at 298 K to approximately 3567 Pa at 300 K. The small temperature rise produces this roughly 12.5% increase.
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