128. Hexadecanol, C16H33OH (insoluble in water), is sometimes used to coat the surface of tanks to prevent water from evaporating. If the area of a hexadecanol molecule in a saturated monolayer is 0.20 nm2, then how many grams of this substance would be required to cover a 10-acre (40,000 m2) lake with a monomolecular film?

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