calculate the mole fraction of ethylene glycol in a solution containing 20% of C₂H₆O₂by mass.

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Solution

Mass of ethylene glycol in 100 g of solution= 20g
mass of water in 1oo g solution= 80 g.
number of moles of ethylene glycole= 20/69 =0.2
number of moles of water =80/18 =4.44
mole fraction of ethylene glycol = 0.2/(4.44+0.2) = 0.04

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