# Calculate the Molarity of the solution and mass of benzene in the sample?

Several years ago, millions of bottles of mineral water were contaminated with benzene at ppm levels. A 250-mL sample of mineral water has 12.7 ppm of benzene. Assuming that the contaminated mineral water is a very dilute aqueous solution, its density is 1.00 g mL–1.

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- davidLv 72 months ago
ppm = 1g/1,000,000mL

12.7 ppm X 1g/1,000,000mL X 250 mL = 0.003175 g

. . .molar mass C6H6 = 78g/mol

0.003175 g X 1mol/78g X 2/0.25L = 0.0001628205 M --- round as needed for sig figs

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