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JEE Main · 2024 · 09 Apr 2024 · Shift 2 · Chemical Thermodynamics

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.

Answer: 400

Solution

At the boiling point (equilibrium at 1 atm),

Δ G_{v a p} = 0

:

Δ H_{v a p} = T Δ S_{v a p}

T = \frac{Δ H _{v a p}}{Δ S _{v a p}} = \frac{30 \times 1000 J/mol}{75 J mol ^{- 1} K ^{- 1}} = 400 K

JEE Main · 2024 · 09 Apr 2024 · Shift 2 · Integer answer

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