Standard Molar Entropy at Point 1 in Thermodynamics Formulas

Yes, the Standard Molar Entropy at Point 1, measured in Specific Entropy can be negative.

Standard Molar Entropy at Point 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 Standard Molar Entropy at Point 1 can be measured.