1ppm contamination = 0.001gm contamination in 1000gm solution
Now 0.8 ppm contamination =0.0008 gm contamination in 1000 gm solution
Therefore in 1000 gm solution solute present = 0.0008 gm
ATQ, In 500 gm solution the amount of solute is = 0.0008/2 gm
= 0.0004 gm
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