Q.

A solution prepared by dissolving 0.8gm of naphthalene in 100g of CCl4 has a boilingpoint elevation of 0.4°C. A 1.24 g of an unknown solute in same amount of CCl4 produced boiling point elevation of 0.62°C, then molar mass of unknown solute is
 

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a

25g

b

50g

c

128g

d

75g

answer is D.

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Detailed Solution

WA=0.8g , Wo=100g, TbA=0.4oc WB=1.24g, TbB=0.62oc TbATbB=nAnB=0.8/1281.24/MB 0.40.62=0.8128×MB1.24 MB=0.4×128×1.240.62×0.8=128

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