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This Comment presents thermograms which demonstrate that glass transition temperatures, Tgs, the change in heat capacity, ΔCp, and the quasi-invariant point, (C'g,T'g), of citric-acid/H2O are not consistent with those reported by Lienhard et al. This raises doubts about validity of their estimation of the excess mixing entropy difference, ΔS(l)mix-ΔS(g)mix, at the Tg.

Comment on “Experimental evidence for excess entropy discontinuities in glass-forming solutions” [J. Chem. Phys. 136, 074515 (2012)]