1.

Calculate the mole fraction in 2.5 m aqueous solution .

Answer»


Solution :2.5 m AQUEOUS solution MEANS that 2.5 MOLES of the solute are dissolved in 1000 g of water.
`"No. of moles of water in 1000 g" =("Mass of water")/("Gram molar mass")=((1000g))/((18"g mol"^(-1)))=55.5 mol`
`"Mole fraction of solute"=("No. of moles of solute")/("No. of moles of solute + No. of moles of water")`
`((2.5 mol))/((2.5 mol+55.5 mol))=((2.5 mol))/((58 mol))=0.043`.


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