1. Stating the problem: We want to find the percentage yield of ethanol obtained from fermentation given the actual mass of ethanol obtained is 24 g. 2. The percentage yield formula is: $$\text{Percentage yield} = \left(\frac{\text{Actual yield}}{\text{Theoretical yield}}\right) \times 100$$ 3. To calculate the % yield, we need the theoretical yield, which is the maximum amount of ethanol expected from the fermentation process. 4. Theoretical yield depends on the initial amount of sugar and stoichiometry of the reaction, but since it is not provided, let's assume a theoretical yield of $x$ grams. 5. Then the percentage yield is: $$\text{Percentage yield} = \frac{24}{x} \times 100$$ 6. Without the theoretical yield value, the exact % yield cannot be calculated. Please provide the theoretical yield or initial sugar amount to find the exact percentage yield.