The maximum contaminant level of copper (cu) in drinking water as set by the the environmental protection agency (epa) is 0.0013 g⋅l−1 . express this concentration in parts per million (ppm). assume the density of water is 1.00 g/ml .

Answer is: concentration is 1.3 ppm.

Parts-per-million (10⁻⁶) is present at one-millionth of a gram per gram of sample solution, for example mg/kg.

d(Cu) = 0.0013 g/L; mass concentration of copper.

d(H₂O) = 1.00 g/mL; density of water.

m(H₂O) = V(H₂O) · d(H₂O).

m(H₂O) = 1000 mL · 1 g/mL.

m(H₂O) = 1000 g ÷ 1000 g/kg.

m(H₂O) = 1 kg; mass of water.

m(Cu) = 0.0013 g · 1000 mg/g.

m(Cu) = 1.3 mg; mass of coppper.

concentration = 1.3 mg ÷ 1 kg.

concentration = 1.3 mg/kg.

concentration = 1.3 ppm.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.