Ideal Solution Entropy of Component 1 in Solution Thermodynamics Formulas

Yes, the Ideal Solution Entropy of Component 1, measured in Specific Entropy can be negative.

Ideal Solution Entropy of Component 1 is usually measured using the Joule per Kilogram K[J/kg*K] for Specific Entropy. Calorie per Gram per Celcius[J/kg*K], Joule per Kilogram per Celcius[J/kg*K], Kilojoule per Kilogram per Celcius[J/kg*K] are the few other units in which Ideal Solution Entropy of Component 1 can be measured.