Answer:

Explanation:

The molarity and molality of solution is, 3.425 mole/L and 4.269 mole/Kg respectively.

Solution : Given,

Density of solution =     

Density of ethanol (solute)=

Molar mass of ethanol (solute) = 46.07 g/mole

20 % aqueous ethanol solution by volume means that the 20 ml of ethanol is present in the 100 ml of solution.

So, the volume of solution = 100 ml

Volume of ethanol (solute) = 20 ml

First we have to calculate the mass of solution.

Now we have to calculate the mass of solute, ethanol.

Now we have to calculate the mass of solvent.

Now we have to calculate the molarity of solution.

Now we have to calculate the molality of solution.

Therefore, the molarity and molality of solution is, 3.425 mole/L and 4.269 mole/Kg respectively.

Explanation:

20% aqueous ethanol solution by volume means 20 ml/ ethanol in 80 ml/ water. Answer : The molarity and molality of solution is, 3.425 mole/L and 4.269 mole/Kg respectively