The standard Gibbs free energy of formation of is zero.
(a) H₂O (l)
(b) O (g)
(c) H₂ (g)

Question

The standard Gibbs free energy of formation of is zero. (a) H₂O (l) (b) O (g) (c) H₂ (g)

Quizplus · Accepted Answer

The standard Gibbs free energy of formation of a substance is defined as the energy change involved in the formation of one mole of a substance from its constituent elements in their standard states. If the standard Gibbs free energy of formation of a substance is zero, it means that the substance is already in its standard state or has no energy change involved in its formation. Therefore, the only substance that meets this criteria is H₂ (g) since it is already in its standard state. The other two choices involve the formation of the substance from its constituent elements, which would require energy input and result in a non-zero value for the standard Gibbs free energy of formation.

The Standard Gibbs Free Energy of Formation of Is Zero