1.80g of solute A was dissolved in 62.5cm3 of ethanol and freezing point of the solution was found to be 155.1 K . The molar mass of solute A is __________g mol-1.

[Given: Freezing point of ethanol is 156.0 K. Density of ethanol is 0.80 g cm-3. Freezing point depression constant of ethanol is 2.00 K kg mol-1]

0 2 Views | Posted 2 months ago
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    Answered by

    alok kumar singh | Contributor-Level 10

    2 months ago

    Δ T f = K f × m  

    ( 1 5 6 1 5 5 . 1 ) = 2 × 1 . 8 M W × 1 0 0 0 ( 6 2 . 5 × 0 . 8 )                

      0.9 =   2 × 1 . 8 × 1 0 0 0 M W × 5 0


    M W = 8 0 g m / m o l      

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