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Lead is a toxic metal that affects the central nervous system. A Pb-contaminated water sample contains...

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Chemistry

Lead is a toxic metal that affects the central nervous system. APb-contaminated water sample contains 0.0010 % Pb by mass

How much of the water (in mL) contains 145 mg of Pb? (Assume adensity of 1.0 g/mL.) Express your answer using two significantfigures.

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4.5 Ratings (838 Votes)

0.001% means 0.001 g of Pb in 100g of H2O

1 g of Pb present in (100/0.001 )*1 = 10^5 g of H2O

145 mg of Pb present in 10^5 * 145 * 10^-3 g

                                            = 14500 g of water

                                           = 1.45 * 10^4 g of H2O

since density = 1 g /mL then        

                                  = 1.4 * 10^4 mL of H2O (2 significants)
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