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

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, ΔSlmix-ΔSgmix, at the Tg. [ABSTRACT FROM AUTHOR]