Question

calculate the molarity of a solution of ethanol in water in which the mole fraction of ethanol is 0.040(assume the density of water to be one).

Please answer in stepwise
(if you don't know the way, there is no need to answer)​

Answer 1

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For dilute solutions, 1 L of water (or 1 L of solution) contains = 1000/18 =55.55 moles of water

Let n be the number of moles of ethanol. The mole fraction of ethanol is 0.040

Hence, 0.040= n

⠀⠀⠀⠀⠀⠀⠀_________

⠀⠀⠀⠀⠀⠀⠀⠀n+55.55

n= 2.222

⠀_________ = 2.31 moles

1-0.040

The molarity of the solution is the ratio of the number of moles of solute present in 1 L of solution.

As 1 L of solution contains 2.31 moles of ethanol, the molarity of a solution is 2.31 M.

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