NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How are moles (mols) calculated?

  1. mg/MW

  2. g/MW

  3. (mg x valence) / MW

  4. Q1 = Q2 x C2 / C1

The correct answer is: g/MW

The formula for calculating moles (mols) is mass (g) / molar mass (MW). Option A, mg/MW, is incorrect because the units do not cancel out to give moles. Option C, (mg x valence) / MW, is incorrect because it only applies to ionic compounds with a defined valence. Option D, Q1 = Q2 x C2 / C1, is incorrect because it is a formula for calculating concentration, not moles.