Which statement correctly describes the standard Gibbs free energy of formation,
CHEMISTRY · Single correct · A Level · Chemistry · Thermodynamics · Thermodynamics
Problem
Which statement correctly describes the standard Gibbs free energy of formation, ΔGf∘, of an element in its most stable form at 298 K and 1 bar?
(a) It equals the element’s standard molar entropy at 298K.
(b) It equals the element’s standard molar Gibbs free energy of sublimation.
(c) It is assigned a value of zero by definition.
(d) It is negative for elements that exist as gases at 298K because gas formation is spontaneous.