In a solution containing 20g of a powder per litre, 0.3338 ppm of a metal was found. How much would the metal be in mg per kg of the solidx powder?

Question

Determination of metal contaminant in a powder sample. (Chemistry) 

Answer 1

0.3338 ppm metal is equal to 0.3338 mg metal/liter

20 g of powder is equal to 0.02 kg of powder 

Thus, you have 0.3338 mg metal/0.02 kg powder

Answer = 0.3338 mg metal/0.02 kg powder = 16.69 mg metal/kg powder = 17 mg metal/kg powder (to 2 sig. figs.)