Question

Mass of ethanol to be added to 1.0 kg water to have the mole fraction of ethanol equal to 0.20?
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Answer 1

Answer:

18 g water = 1 mole

so 1kg water= 1000/18 moles

46 g ethanol= 1mole

mole fraction of ethanol= moles of ethanol/ total moles ( water+ ethanol )

now you can calculate

to cross check the ans is approximately 13 moles= 598 g