SATHEE: Solutions Question 386

Solutions Question 386

Question: A 5% solution of cane sugar (molar mass 342) is isotonic with 1% of a solution of an unknown solute. The molar mass of unknown solute in g /mol is

Options:

A) 136.2

B) 171.2

C) 68.4

D) 34.2

Show Answer

Answer:

Correct Answer: C

Solution:

Two solutions are isotonic if their osmotic pressure are equal $π_{1} = π_{2}$ $M_{1} S T_{1} = M_{2} S T_{2}$ ( $M_{1}$ and $M_{2}$ are molarities)

At a given temperature, $M_{1} = M_{2}$ $\underset{C o n e s u g a r}{\frac{1000, w_{1}}{m_{1} v_{1}}}, = \underset{U n k n o w n}{\frac{1000, w_{2}}{m_{2} v_{2}}},$

$(V_{1} = V_{2}, 100, m L)$

$∴$ $\frac{w_{1}}{m_{1}} = \frac{w_{2}}{m_{2}}$ $\frac{5}{342} = \frac{1}{m_{2}}$ $m_{2} = \frac{342}{5} = 68.4, g, m o l^{- 1}$

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Solutions Question 386

Question: A 5% solution of cane sugar (molar mass 342) is isotonic with 1% of a solution of an unknown solute. The molar mass of unknown solute in g /mol is

Options:

Answer:

Solution:

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