The normal boiling point and Δ H_ vap of a liquid ' X ' are 400 K and 40 ~kJ ~mol^ -1 respectively. Assuming Δ H_ vap to be constant, which of the following is correct? I. Δ S_ vap >100 ~J ~K^ -1 ~mol^ -1 at 400 K and

Correct answer: C. I and III No Solution

Olympiad workbook

Olympiad workbook · NSEC · Thermodynamics (C)

The normal boiling point and Δ H_ vap of a liquid ' X ' are 400 K...

The normal boiling point and

\Delta \mathrm{H}_{\text {vap }}

of a liquid ' X ' are 400 K and

40 \mathrm{~kJ} \mathrm{~mol}^{-1}

respectively. Assuming

\Delta \mathrm{H}_{\text {vap }}

to be constant, which of the following is correct? I.

\Delta \mathrm{S}_{\text {vap }}>100 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}

at 400 K and 0.5 atm II.

\Delta \mathrm{S}_{\text {vap }} < 100 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}

at 400 K and 1 atm III.

\Delta \mathrm{S}_{\text {vap }} < 100 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}

at 400 K and 2 atm IV.

\Delta \mathrm{S}_{\text {vap }}=100 \mathrm{~kJ} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}

at 400 K and 1 atm

C. I and III

No Solution