Step 1:

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(a) $\"\"$

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The chemical reaction is $\"\"$ .

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Standard free energy change :

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Standard free energy change in terms of $\"\"$ .

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$\"\"$

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$\"\"$ ,

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where $\"\"$ is the standard free energy change.

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$\"\"$ is the free energy change.

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n is the number of moles.

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Free energy change $\"\"$ for CO₂ is $\"\"$ .

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Free energy change $\"\"$ for H₂O is $\"\"$ .

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Free energy change $\"\"$ for C₆H₆ is $\"\"$ .

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Free energy change $\"\"$ for O₂ is $\"\"$ .

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$\"\"$

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Step 2:

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(b)

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For a spontaneous reaction, $\"\"$ .

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Here $\"\"$ .

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Hence the reaction is a spontaneous reaction.

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Solution :

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(a) $\"\"$ .

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(b) The reaction is a spontaneous reaction.