Question

re
Ques calculate the mole fraction of Ethyl Alcohol in it's
46% by mass Aquas
Solution​

Answer 1

Answer:

Explanation:

hi there.....!!

mole fraction = mole of one of the component of the solution

                                                 total moles of the solution

Calculating the mole fraction of ethanol for the question above: 

Note: we will use a 100 g sample of this solution for the calculation.

Percentage by weight of ethyl alcohol is 46%...that means in 100 g of this solution is 46 g while the mass of the water will be 54% of 100 g = 54g.

Find the moles of water and the ethyl alcohol {molar mass of water(H₂O) = 18 and molar mass of ethyl alcohol(C₂H₆O = 46}

Moles = mass/molar mass

moles of ethanol = 46/46 = 1

moles of water = 54/18 = 3

total moles = 1 + 3 = 4

Mole fraction of ethanol is: 

                    Mole of ethanol            =   1/4

                  Total mole of solution

Therefore the mole fraction is 1/4 or 0.25

hope this helps you......!!!

Answer 2

Question:

Calculate the mole fraction of ethyl alcohol in its 46% by mass aqueous solution.

Answer:

$\bigstar{\bold{Mole\:fraction\:of\:C_2H_5OH=\:0.25}}$

Explanation:

$\Large{\underline{\underline{\bf{Given:}}}}$

• Mass percent of Ethyl alcohol in solution = 46%

$\Large{\underline{\underline{\bf{To\:Find:}}}}$

• Mole fraction of ethanol (C₂H₅OH)

$\Large{\underline{\underline{\bf{Solution:}}}}$

→ Mass of C₂H₅OH = 46g

→ Mass of solution = 100g

→ Mass of solvent(H₂O) = (100-46)=54g

→ Molar mass of C₂H₅OH = 24+5+16+1 =46

→ Molar mass of H₂O = 2+16=18

→ No: of moles of ethanol = Given mass/ Molar mass

  No: of moles of ethanol = 46/46 = 1 mole

→ No: of moles of water = 54/18 = 3 moles

→ Mole fraction of ethanol = No: of moles of ethanol/No: of moles of    solution

→ Substituting the datas we get,

  Mole fraction of ethanol =1/(1+3)=1/4

  $\boxed{\bold{Mole\:fraction\:of\:C_2H_5OH=\:0.25}}$

$\Large{\underline{\underline{\bf{Notes:}}}}$

• Mole fraction of a substance is given by
• Mole fraction = No: of moles of substance/No: of moles in solution
• No: of moles = Given mass/Molar mass