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Q.

Sea water contains 29.25% NaCl and 19% MgCl2 by weight of solution. The normal boiling point of the seawater is ________ oC (Nearest integer)
Assume 100% ionization for both NaCl and MgCl2
Given: Kb (H2O) 0.52K kg mol-1
Molar mass of NaCl and MgCl2 is 58.5 and 95 g mol-1 respectively

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answer is 116.

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Detailed Solution

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No of moles of Nacl = 29.25/58.5 = 0.5
Total no of ions = 0.5 x 2 = 1
MgCl2 = 19/95 = 0.2
Total no of ions = 0.2 x 3 = 0.6
Wwater =51.75ΔTb=Kb×m =0.52×1.651.75×1000
= 0.52 x 30.9
= 16

Tb = 100+16 =116

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