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A swimming pool reading reports that chlorine is present at 30 ppm. How many grams of chlorine are present per liter of pool water?

If 100. mL of a 1.0 M solution is evaporated to a volume of 25 mL, what will be the concentration of the resulting solution? how do you do this? i know the answer is 4.0 M but I don't know how. :[