Question

What is mole fraction. 46 gm of ethyl alcohol is dissolved in 90 gm of water. Calculate mole fraction of water and ethyl alcohol.
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Answer 1

Answer:

Explanation:

No. of moles (nA) of ethyl alcohol = 4646=1

No. of moles (nB) of water =9018=5

∴ Mole fractioni of ethyl alcohol =nA / nA+nB =1 / 1+5=1/6

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Answer 2

Answer:

mole fraction of water is 0.833 and mole fraction of ethyl alcohol is 0.167

Explanation:

Molecular mass of ethyl alcohol = 46 g

Mass of ethyl alcohol = 46 g

no. of moles of ethyl alcohol in sol. =  46 g /46 g  = 1 mole

Molecular mass of H₂O = 18 g

Mass of water=90 g

no. of moles of H₂O in solution =  90 g /18 g  = 5 mole

total  no. of moles in solution = 1 + 5 = 6

Mole fraction of ethyl alcohol =  $\frac{no of mole of ethyl alcohol}{total number of mole } =\frac{1}{6} =0.167$= 0.5

no of mole of water=1-nomber of mole of ethyl alcohol

                                =1-0.167=0.833