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Question

For the given reaction,


H2(g)+Cl2(g)2H+(aq)+2Cl(aq);

ΔG0=262.4kJ

The value of free energy of formation (ΔG0f) for the ion Cl1(aq), therefore will be:

A
131.2 kJ mol1
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B
+131.2 kJ mol1
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C
262.4 kJ mol1
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D
+262.4 kJ mol1
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Solution

The correct option is A 131.2 kJ mol1
(ΔG0) reaction =ΔG0f (Products) ΔG0f (reactants)
264.4=[2ΔG0f(H+)+2ΔG0f(C1)]
or 264.4=[ΔG0f(H2)+ΔG0f(Cl2)]
=[0+2ΔG0f(Cl)]+[0+0]
or, 262.4=2ΔG0f(Cl)
or, ΔG0f(Cl)=131.2 kJ mol1

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