If 45 grams of ethanol (d = 0.789g/ml) are dissolved in 75 grams of water (d = 1.0g/ml), what is the percent by volume of ethanol in this solution?

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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the answer is true.