Question

what is the mole fraction of the solute in 2.5m aqueous solution

Answer 1

2.5 molal aqueous solution means 2.5 moles of solute in 1 kg solvent(water)

so, moles of solute=2.5

moles of water=1000/18=55.55(approx)

so mole fraction = 2.5/(2.5+55.55)=.043