Question

If the mole fraction of acetone in water is 0.2 then the mass percentage (w/w) of acetone in the solution will be (Molar mass of acetone = 58 g​

Answer 1

Answer:

Mole fraction of solute=  

Total number of moles  of all the solvent

Moles of solute

​  

 X_{A}= \frac{mol A}{mol A + mol B}X  

A

​  

=  

molA+molB

molA

​  

 

And

X_{B}= \frac{mol B}{mol A + mol B}X  

B

​  

=  

molA+molB

molB

​  

 

Note:

1. In the given mixture, sum of all the mole fractions is equal to one.

XA + XB = 1

2. The multiplication of the mole fraction by 100 gives the mole percentage.

3. Mole fraction is a unitless and dimensionless expression

Explanation:

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Answer 2

Answer:

Concept :

The chemical molecule acetone, also known as propanone or dimethyl ketone, has the formula (CH3)2CO. The smallest and most basic ketone. It is a colourless, very combustible liquid with a distinctively strong smell. Because it is miscible with water, acetone is used as a significant organic solvent in industry, the household, and laboratories. In 2010, around 6.7 million tonnes were manufactured globally, mostly for use as a solvent in the synthesis of bisphenol A, methyl methacrylate, and PMMA. It is a frequent component in organic chemistry. Acetone is a common home product used as paint thinner and a component in nail polish remover. In the US, it is free from volatile organic compound (VOC) regulations.

Explanation:

Given :

$x_{B}$ = 0.2 ,

$x_{A}$ = 0.8

Solution :

Now,

Molality (m) =  $\frac{x_{B}* 1000 }{x_{A} * MA}$

​                    =  $\frac{0.2 * 1000}{ 0.8 * 18}$

                   = 13.88m

where, MA = molar mass of solvent

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