Question

A solution contains 92g of ethanol and 72g of water what is the mole fraction of ethanol in the solution

Answer 1

Answer:

Explanation:

Number of moles= Given Mass/MolarMass

So, Number of moles of Ethanol= 92/46

= 2.

Number of moles of water= 72/18

= 4.

Mole Fraction of Ethanol =

No. of Moles of Ethanol/Total no. of moles

= 2/(2+4)

= 1/3.

Answer 2

Mole fraction of ethanol in solution is 0.3.

Given - Mass of ethanol and water

Find - Mole fraction of ethanol

Solution - Mole fraction of ethanol = number of moles of ethanol/number of moles of water + number of moles of ethanol

Number of moles of water = mass/molar mass

Number of moles of water = 72/18

Number of moles of water = 4

Number of moles of ethanol = mass/molar mass

Number of moles of ethanol = 92/46

Number of moles of ethanol = 2

Mole fraction of ethanol = 2/(2+4)

Mole fraction of ethanol = 2/6

Mole fraction of ethanol = 1/3

Hence, the mole fraction of ethanol is 0.3.

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