Producing ethanol by fermentation

Yeast makes ethanol

Fermentation uses enzymes in yeast to convert sugars into ethanol and carbon dioxide. Glucose is a suitable sugar. The products can be summarised as glucose → ethanol + carbon dioxide; a balanced representation is C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. The ethanol remains dissolved in the original water, so fermentation produces an aqueous ethanol solution rather than pure ethanol.