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25.0 mL of ethanol (density = 0.789 g/mL) initially at 7.0 degrees celsius is mixed with 35.0 mL of water (density = 1.0 g/mL) initially at 25.3 degrees celsius in an insulated beaker. Assuming that no heat is lost, what is the final temperature of the mixture?

  • Chemistry -

    Use density to convert mL ethanol to grams.
    Use density to convert mL H2O to grams.

    heat gained by ethanol + heat lost by H2O = 0
    [mass ethanol x specific heat ethanol x (Tfinal-Tinitial)] + [mass H2O x specific heat H2O x (Tfinal-Tinitial)] = 0
    Substitute and solve for Tfinal.

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