NAPLEX (North American Pharmacist Licensure Examination) Practice Exam

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What does % w/w mean?

x g/100 mL
x mL/100 mL
x g/100 g
x mL/100 g

The correct answer is: x g/100 g

% w/w stands for "percent weight/weight" and is a unit of measurement that represents the percentage of a certain substance by weight in a given quantity. In this case, it means x grams of a substance per 100 grams of the total quantity. Option A and B are incorrect because they use milliliters, a unit of volume, instead of grams, a unit of weight. Option D is also incorrect because it uses milliliters instead of grams. Only option C correctly shows the use of grams for both quantities in the ratio.