When Δ H_vap=30 ~kJ / mol and Δ S_vap=75 ~J ~mol^-1 ~K^-1 , then the temperature of vapour, at one atmosphere is ______ K .

Correct answer: 400. At equilibrium Δ G_PT=0 Δ H_vap =T Δ S_vap 30 × 1000=T × 75 ~T=400 ~K

Q22 / 90 · JEE Main 2024 (09 Apr Shift 2) · Chemistry

When $\Delta \mathrm{H}_{\mathrm{vap}}=30 \mathrm{~kJ} / \mathrm{mol}$ and $\Delta \mathrm{S}_{\mathrm{vap}}=75 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$, then the temperature of vapour, at one atmosphere is ______ $\mathrm{K}$.

Correct answer: 400

Solution

At equilibrium $\Delta \mathrm{G}_{\mathrm{PT}}=0$ $\begin{aligned} & \Delta \mathrm{H}_{\text {vap }}=\mathrm{T} \Delta \mathrm{S}_{\text {vap }} \\ & 30 \times 1000=\mathrm{T} \times 75 \\ & \mathrm{~T}=400 \mathrm{~K} \end{aligned}$

Hence, the correct answer is 400.

Relevant Questions

The plot of vs gives a straight line. The intercept and slope respectively are (where K is equilibrium constant).28 Jan, 2026 (E)Entropy and Second law of thermodynamics
Which of the following mixing of 1 M base and 1 M acid leads to the largest increase in temperature?24 Jan, 2025 (E)Entropy and Second law of thermodynamics
Ice at is heated to become vapor with temperature of at atmospheric pressure. The entropy change associated with this process can be obtaine23 Jan, 2025 (M)Entropy and Second law of thermodynamics
Match List - I with List - II. Choose the correct answer from the options given below :22 Jan, 2025 (E)Entropy and Second law of thermodynamics
30 . 4 kJ of heat is required to melt one mole of sodium chloride and the entropy change at the melting point is 28 . 4 J K 1 mol 1 at 1 atm15 Apr, 2023 (M)Entropy and Second law of thermodynamics
One mole of an ideal gas at 350 K is in a 2 . 0 L vessel of thermally conducting walls, which are in contact with the surroundings. It under12 Apr, 2023 (M)Entropy and Second law of thermodynamics

When \(\Delta \mathrm{H}_{\mathrm{vap}}=30 \mathrm{~kJ} / \mathrm{mol}\) and \(\Delta \mathrm{S}_{\mathrm{vap}}=75 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\), then the temperature of vapour, at one atmosphere is ______ \(\mathrm{K}\).

Solution

Relevant Questions