FWS asked in Science & MathematicsChemistry · 2 months ago

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. 

1 Answer

  • david
    Lv 7
    2 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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