Lead levels in drinking water should be no higher than 15 ppb.What is this in mol/L? Assume the density of drinking water is 1.0 g/mL.

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Quizplus · Accepted Answer

15 ppb Pb = 15 µg Pb/L = 15 ng Pb/mLConvert ng to g:15 ng Pb/mL = 15 × 10−9 g Pb/mLConvert g to mol:15 × 10−9 g Pb/mL × (1 mol Pb/207.2 g Pb) = 7.2 × 10−11 mol Pb/mLConvert mL to L:7.2 × 10−11 mol Pb/mL × (1000 mL/L) = 7.2 × 10−8 mol Pb/LTherefore, the lead level in drinking water is 7.2 × 10−8 mol/L.

Lead Levels in Drinking Water Should Be No Higher Than