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Calculate the molarity and molality of …

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Calculate the molarity and molality of 20 percent aqueous ethanol solution by volume. Assume the solution to be ideal.

    • Posted by Anupam Awasthi 4 years ago

    CBSE > Class 12 > Chemistry
    • 1 answers

    Yogita Ingle 4 years ago

    Density of solution =     

    Density of ethanol (solute)= 

    Molar mass of ethanol (solute) = 46.07 g/mole

    20 % aqueous ethanol solution by volume means that the 20 ml of ethanol is present in the 100 ml of solution.

    So, the volume of solution = 100 ml

    Volume of ethanol (solute) = 20 ml

    First we have to calculate the mass of solution.

    Now we have to calculate the mass of solute, ethanol.

    Now we have to calculate the mass of solvent.

    Now we have to calculate the molarity of solution.

    Now we have to calculate the molality of solution.

    Therefore, the molarity and molality of solution is, 3.425 mole/L and 4.269 mole/Kg respectively.

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