250 g of fish that is known to contain 4.5 ppm of Hg contains 1.125 mg of Hg
It is common to express the amount of contaminants in the unit called ppm. The meaning of ppm is parts per million. This implies the number of milligrams present in 1 kilogram. The fish contains 4.5 mg of Hg in 1Kg of fish from the information provided in the question.
Hence;
4.5 mg is contained in 1000 g of fish
x mg is contained in 250 g of fish
x = 4.5 mg × 250 g/1000 g
x = 1.125 mg of Hg
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