PPM related problem - Random question

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 Hard 1

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How many milligrams of the active pharmaceutical ingredient will 36500 g of a preparation contain, if its strength is expressed as 86.9 PPM?

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lb equals 3171.85 mg kg

    86.9 PPM means, there is 86.9 g of drug in each 1,000,000 g of the mixture.
    The total weight of the preparation = 36500 grams. Therefore, we can write:
    `(86.9 \quad g)/(1,000,000\quad g)=x/(36500\quad g) therefore x = 3.17185` g.

    Now, this g unit has to be converted to mg.
    `(1000\quad mg)/(1\quad g)= y/(3.17185\quadg) therefore y = 3171.85` mg Ans.