Help with ppm problem (general chemistry)

[Dr.9999]

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The concentration of a narcotic in a sample of blood is found to be 8ppm. How many kilograms of the compound will be present in 5L of blood given this concentration? (Assume that the density of blood is equivalent to the density of water).

 

[Papasmurf1234]

1ppm = 1mg/L. (in water)

8mg/L x 5L x 1g/1000mg x 1kg/1000mg = 0.00004 kg

 

[Dr.9999]

Thank You!