Chemistry

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Sea water contains an average of 270 ppm of sulfate ion. Calculate the molar concentration of sulfate given that the average density of sea water is 1.02 g/ml.

-At first i tried assuming that density is 1.00 g/ml which is a common practice in ppm problems but the answer is wrong. What keeps bugging me is the sea water density because I don't know what to do in terms of using it. Any ideas?

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