Discussion
Assertion (A): The theoretical ethanol yield from glucose is only about half by mass.
Reason (R): An equal number of moles of carbon dioxide is produced and leaves the fermenter.
Answer: A
Both are true and the reason gives the accounting: the carbon dioxide is a genuine co-product and is increasingly captured for beverage or industrial use. Half the substrate mass leaves as gas. Distillers increasingly sell that gas as a product.
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