Question

If molality of naoh is 2.5 then calculate mole fraction

Answer 1

Mole fraction = Molality/(molality+55.5)

                     = 2.5/2.5+55.5

                    = 2.5/58

                    = 0.043 is the mole fraction

Answer 2

Hola!!

2.5 M solution means, 2.5 mole solute in 1000g solution.

Considering water as solvent here,

Then, number of moles of solvent

= Weight/ molecular weight

= 1000g/18g

=55.55

Also, (mole fraction of solute =

Moles of solute / total moles)

=> 2.5/(2.5+55.56)

=> 0.043

Happy to help

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