chemistry

posted by Anonymous

A 25.0 mL sample of 1.00 M KBr and a 75.0 mL sample of 0.800 M KBr are mixed. The solution is then heated to evaporate water until the total volume is 50.0 mL. What is the molarity of the KBr in the final soltion?

  1. Davis

    Use the Molarity Formula
    Molarity= moles/liters of solution
    Molarity= moles/0.050 Liters
    To find moles you have to find the moles of each sample of KBr. SO 1.00M KBR times .025liters =.025moles
    And then 0.800M KBR times .075liters=.060moles.
    Then you add the moles of both samples and get .085 moles.
    SO you plug it into the equation:
    Molarity= 0.085moles/0.050liters
    Molarity=1.7mol/L

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