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Thermodynamics question

2006 · Q116
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Thermodynamics question

2006 · Q116

NEETChemistryThermodynamicsMCQ+4 / −1
The enthalpy and entropy change for the reaction:
Br2(l) + Cl2(g) →\to→ 2BrCl(g)
are 30 kJ mol−-−1 and 105 J K−-−1 mol−-−1 respectively.
The temperature at which the reaction will be in equilibrium is
  1. A
    300 K
  2. B
    285.7 K
  3. C
    273 K
  4. D
    450 K
View written solutionFree

Correct answer: B

Δ\Delta ΔG = Δ\Delta ΔH – TΔ\Delta ΔS

Now, at equilibrium Δ\Delta ΔG = 0

0 = Δ\Delta ΔH – TΔ\Delta ΔS

⇒\Rightarrow⇒ 0 = 30000 –T (105)

⇒\Rightarrow⇒ T = 30000105{{30000} \over {105}}10530000​ = 285.7 K

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