Solutions Question 255

Question: Which of the given aqueous solution has the maximum boiling poin’ $ (K_{b},of,H_2O)=0.52{}^\circ ,mo{l^{-1}}kg),,T_{b}(H_2O)=373K) $

Options:

A) 6% urea solution by weight of solution

B) 18% glucose solution by weight of solution

C) 34.2% sucrose solution by weight of solution

D) All have equal boiling points

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Answer:

Correct Answer: C

Solution:

$ \Delta T_{b}=\frac{1000K_{b}w_1}{m_1w_2} $ Boiling point of solution $ =(373+\Delta T_{b}) $ The larger the value of $ \Delta T_{b} $ , the higher the boiling point. $ w_1 $

$ w_2 $

$ m_1 $

$ \Delta T_{b} $ Boiling point
(1) 6.0g 94.0g 60 0.55 373.55K
(2)18g 82g 180 0.63 373.63K
(3) 34.2g 65.8g 342 0.79 373.79K


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