Chlorine is used to disinfect swimming pools. The accepted concentration for this purpose is 1 ppm  chlorine, or 1 g of chlorine per million grams of water.  Calculate the volume of a chlorine solution (in  milliliters) a homeowner should add to her swimming  pool if the solution contains 6.0 percent chlorine by  mass and there are 2.0 × 104 gallons (gal) of water in  the pool (1 gal = 3.79 L; density of liquids = 1.0 g/mL).

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