Question

Br2(g) cl2(g)⇌2brcl(g) δh∘f for brcl(g) is 14. 6 kj/mol. Δs∘f for brcl(g) is 240. 0 j/mol

Answer 1

The Gibbs free energy for the reaction Br²(g) Cl²(g)⇌2BrCl(g) is -56.92 KJ.

What is Gibbs Free energy?

It's the total work done in a closed thermodynamic system.

By the formula of Gibbs free energy

$\rm \Delta G = \Delta H - T \Delta S$

The H is 14.6 KJ/mol

The change in temperature is 0.24

Putting the values in the equation

$\Delta G = 14.6 - (298 \times 0.24)\\\\ \Delta G = 14.6 - 71.52\\\\ \Delta G = -56.92KJ$

Thus, the Gibbs free energy for the reaction is -56.92 KJ

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Answer 2

The Change in Gibb's free energy, ΔG for the reaction at 298K is; -56.92KJ.

Gibb's free energy of reactions

It follows from the Gibb's free energy formula as expressed in terms of Enthalpy and Entropy that;

• ΔG = ΔH - TΔS

On this note, it follows that;

• ΔG = 14.6 - (298× 0.24)

Hence, the Gibb's free energy for the reaction is;

• ΔG = 14.6 - 71.52
• ΔG = -56.92KJ

Remarks: The question requires that we determine the Gibb's free energy for the reaction at 298K.

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