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The weight in g, of the non-volatile solute urea $(NH_2CONH_2)$ to be dissolved in 100 g of water in order to decrease its vapour pressure by 1.8% is:

$\begin {array} {1 1} (1)\;6.0 & \quad (2)\;0.3 \\ (3)\;3.0 & \quad (4)\;0.6 \end {array}$

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(1) 6.0
answered Nov 7, 2013 by pady_1
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