A hard water sample contains 0.0085% Ca by mass (in the form of Ca 2 + ions).
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A hard water sample contains 0.0085% Ca by mass (in the form of Ca2 + ions). How much water (in grams) contains 1.2 g of Ca?
(1.2 g of Ca is the recommended daily allowance of calcium for adults between 19 and 24 years old.)
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