Liquid paraffin . . . . . . . . . . . . .  20 mL           Zinc oxide . . . . . . . . . . . . . . . . .15 mg           Yellow wax, q.s. ad . . . . . . . . .100 g What is the amount of liquid paraffin (d = 0.88 g/mL) to be weighed when preparing 250 g of the above prescription?   a 8.8 g   b 11.4 g   c 44.0 g   d 56.8 g

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.