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4 July, 16:10

Calculate the vapor pressure (in torr) at 298 K in a solution prepared by dissolving 42.4 g of the non-volatile non-electrolye urea {CO (NH2) 2} in 195 g of ethanol. The vapor pressure of ethanol at 298 K is 58.9 torr. Give your answer to 2 decimal places.

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  1. 4 July, 16:36
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    The vapor pressure at 298 K for this solution is 50,49 Torr.

    Explanation:

    We have to apply Raoult's law to solve this which its formula is:

    P pure sv° - P sl = P pure sv°. X (molar fraction)

    ΔP = P pure sv°. X (molar fraction)

    58,9 Torr - P sl = 58,9 Torr. X

    Molar mass urea CO (NH2) 2: 60,06 g/m

    Molar mass ethanol: 46,07 g/m

    Moles for urea: 42,4 g / 60,06 g/m = 0,705 moles

    Moles for ethanol: 195 g / 46,06 g/m = 4,233 moles

    X (molar fraction) : moles from solute / moles from solute + moles from solvent

    X (molar fraction) : 0,705 / 0,705 + 4,233 = 0,142

    58,9 Torr - P sl = 58.9 Torr. 0,142

    58,9 Torr - 8,40 Torr = P sl

    50,49 Torr = P sl
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