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Doubt & Answer Explanation

Doubt

Find out the mole fraction of NaOH solution containing 4g of solute in 90g of water.

Answer Explanation

4g of NaOH are present in 90 g of water. The molecular weight of NaOH is 40 and that of water is 18.

So, the moles of NaOH are 4/40 = 0.1 and the moles of water are 90/18 = 5.

Hence the mole fraction of NaOH is 0.1/(0.1+5) = 0.0196

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