The definition of the standard (molar) Gibbs energy of formation (ΔG f°) parallels that of ΔHf°; since ‘formation’ signifies a particular kind of reaction, what is the reaction corresponding to ΔGf° of CO2(g)?
Given that ΔGf°(CO2(g)) = -394.4 kJ/mol, what can we say about the stability of carbon dioxide (relative to its elements)?
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