1.

Lowering of vapour pressure in 1 motal aqueous solution at 100^@C is

Answer»

<P>13.44 mm Hg
14.12 mm Hg
31.2 mm Hg
35.2 mm Hg

Solution :MOLALITY and mole fraction are RELATED as follows :
`m = (x_B XX 1000)/((1-x_B)m_A), 1 = (x_B xx 1000)/((1-x_B) xx 18)`
`x_B` = mole fraction of solute, `m_A` = molar mass of solvent
`x_B` = 0.0176, `x_A` = 0.9824, p=p `x_A`
`=p 760 xx 0.9824=746.624 , Delta p = p-p= 760 -746.624`
`~~` 13.4 mm Hg


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