This study was conducted to determine the best concentration of Tween80™ in the manufacture of bioethanol from coconut water condensed by Saccharomyces cerevisiae. This study with increasing the urea and Tween80™ varying concentrations of this study conducted an experiment with four treatments and measurement in duplicate. Concentration of Tween80 ™ were T10 (0%), T2 (0.1%), T3 (0.2%) and…