NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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Ace your North American Pharmacist Licensure Examination (NAPLEX) with our comprehensive practice test. Features include interactive flashcards, multiple-choice questions, with detailed hints and explanations. Fast-track your pharmacy career today!

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What is the formula to calculate specific gravity of a substance?

Volume of substance / volume of water
Weight of substance / weight of equal volume of water
Weight of equal volume of water / weight of substance
Density of substance / density of water

The correct answer is: Weight of substance / weight of equal volume of water

The formula for calculating specific gravity is the weight of a substance divided by the weight of an equal volume of water. This is because specific gravity is a ratio of the density of a substance to the density of water, and density is calculated using weight and volume. Option A would not result in an accurate specific gravity calculation as it does not take into account the weight of the substance. Option C is also incorrect as it reverses the order of the weight values, which would result in an incorrect ratio. Option D involves using densities, which are not the same as weight, making this formula incorrect for calculating specific gravity.