Which substance(s) listed below has(have) a standard molar Gibbs Free Energy of formation, D G f , value equal to 0 kJ/mol?
I. H₂ (g)
II. N₂( )
III. H₂ O ( )

Question

Which substance(s) listed below has(have) a standard molar Gibbs Free Energy of formation, D G f , value equal to 0 kJ/mol?
I. H₂ (g)
II. N₂(  )
III. H₂ O (  )

Quizplus · Accepted Answer

The standard molar Gibbs Free Energy of formation, ΔGf, represents the energy change when one mole of a substance is formed from its constituent elements in their standard states. A ΔGf value of 0 kJ/mol indicates that the substance is in its most stable form and no energy is required for its formation. The ΔGf values for H₂ (g) and N₂ (g) are both 0 kJ/mol, while the ΔGf value for H₂O (l) is -237 kJ/mol. Therefore, only I (H₂) has a ΔGf value of 0 kJ/mol.

Which Substance(s) Listed Below Has(have) a Standard Molar Gibbs Free