The concentration of a solution can be expressed in
(I ) milliliters per minute
(2) parts per million
(3) grams per Kelvin
(4) joules per gram

Answer:(2) parts per millionExplanation:Concentration of a solution can be expressed in terms of parts-per-million (ppm).ppm is usually used in the context of measuring very small concentrations particularly the amount of contaminants. It represents 1 part of the contaminant in 100000 parts of the total. It is expressed as:1 ppm = 1 mg / L 1 ppm = 1 mg/ Kg

(I ) milliliters per minute(2) parts per million(3) grams per Kelvin(4) joules per gram