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What is the mass of urea( …

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What is the mass of urea( molar mass60g/mol)dissolved in 50g of water so as the vapour pressure of the solution reduced to 25%.

    • Posted by Aarav Gahlawat 7 years, 4 months ago

    CBSE > Class 12 > Chemistry
    • 2 answers

    Aarav Gahlawat 7 years, 4 months ago

    If we not neglect the moles of solvent in denominator; can we still get the right answer

    0Thank You

    Prerna Kumari 7 years, 4 months ago

    Let VP of water be 100 then VP of solution is 25 Therefore, (100-25)/100 = mole of urea÷ mole of water, 75/100 = (m/60) ÷ (50 /18), 75/100 = 3 m / 500, m = (75×5)/3= 125gm. Hence mass of urea = 125gm

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