NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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How are millimoles (mmols) calculated?

g/MW
mg/MW
mEq
(mg x valence) / MW or mmols x valence

The correct answer is: mg/MW

To calculate millimoles (mmols), we use the formula: mg/MW (milligrams divided by molecular weight). This formula allows us to convert the mass of a substance (in milligrams) to millimoles based on its molecular weight. By dividing the mass in milligrams by the molecular weight of the substance, we can determine the amount of the substance in millimoles. This calculation is essential in pharmacy practice for accurately measuring and dosing medications based on their molecular weights. Option A (g/MW) is not the correct formula for calculating millimoles. It uses grams instead of milligrams in the numerator, which would yield a different value. Option C (mEq) is a unit of measurement for the amount of substance of interest, but it is not the formula used specifically for calculating millimoles based on mass and molecular weight. Option D is a combination of two different calculations where one includes the valence of the substance. It is not the standard formula for basic millimole calculation based on mass and molecular weight.