What is the mole fraction of solute in 2.5 molal solution?
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2.5 molal aq soln means 2.5 solute in 1000 gm water. Therefore, mole of water is 1000/18 i.e, 55.55. Mole fraction's formula is Xa= [{n(solute)}/{n(solute)+n(solvent)}] and that according to question is 2.5/(2.5+55.55) = 2.5/ 58.05 = 0.43066 is the answer.
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