SATHEE: Some Basic Concepts Of Chemistry Question 16

Some Basic Concepts Of Chemistry Question 16

Question: Mole fraction of ethanol in ethanol water mixture is 0.25. Hence, the percentage concentration of ethanol by weight of mixture is

Options:

A) 25%

B) 75%

C) 46%

D) 54%

Show Answer

Answer:

Correct Answer: C

Solution:

$χ_{2} = \frac{n_{2}}{n_{1} + n_{2}} = 0.25$ (ethanol) (solute) $(M w_{2} = 46 g)$ $χ_{1} = \frac{n_{1}}{n_{1} + n_{2}} = 0.75$ (water) (solvent) $(M w_{1} = 18 g)$ $\frac{χ_{1}}{χ_{2}} = \frac{n_{1}}{n_{2}} = \frac{3}{1} \Rightarrow \frac{W_{1} \times M w_{2}}{M w_{1} \times W_{2}} = \frac{3}{1}$ $\frac{W_{1} \times 46}{18 \times W_{2}} = 3$ $\frac{W_{1}}{W_{2}} = 1.17$
$∴$ $\frac{W_{2}}{W_{1} + W_{2}} = 0.46$

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Some Basic Concepts Of Chemistry Question 16

Question: Mole fraction of ethanol in ethanol water mixture is 0.25. Hence, the percentage concentration of ethanol by weight of mixture is

Options:

Answer:

Solution:

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