chemistry

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?

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  1. 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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    posted by Davis

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