Find drug weight from PPM and total quantity

3. Percent, Ratio, mg/mL, PPM, PPB 3.4) PPM and PPB 3.4.1) PPM, PPB - General Drug weight from PPM and total Weight Easy 1

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The strength of a medication is expressed as 18.7 PPM. How many milligrams of the drug will 0.5 kilogram of this product contain?

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lb equals 9.35 mg kg

    18.7 PPM means, there is 18.7 g of drug in each 1,000,000 g of the mixture.
    0.5 kilogram means 500 grams. Therefore, we can write:
    `(18.7 \quad g)/(1,000,000\quad g)=x/(500\quad g) therefore x = 0.00935` g.

    Now, this g unit has to be converted to mg.
    `(1000\quad mg)/(1\quad g)= y/(0.00935\quadg) therefore y = 9.35` mg Ans.