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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How many milligrams of the active pharmaceutical ingredient will 31500 g of a preparation contain, if its strength is expressed as 25.3 PPM?

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lb equals 796.95 mg kg

    25.3 PPM means, there is 25.3 g of drug in each 1,000,000 g of the mixture.
    The total weight of the preparation = 31500 grams. Therefore, we can write:
    `(25.3 \quad g)/(1,000,000\quad g)=x/(31500\quad g) therefore x = 0.79695` g.

    Now, this g unit has to be converted to mg.
    `(1000\quad mg)/(1\quad g)= y/(0.79695\quadg) therefore y = 796.95` mg Ans.

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