The mole fraction of the KOH is 0.025.
We know that the mole fraction is the ratio of the moles to the total number of moles.
Thus;
Number of moles of KOH = 56g/56 g/mol = 1 mol
Number of moles of water = 700.0g/18 g/mol = 39 moles
Now;
Mole fraction of KOH = 1 mol/1 mol + 39 moles = 1/40 = 0.025
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