AP EAPCET 25-Aug-2021 Shift 2 Paper

l molal solution means 1 mol of solute in 1000g or 1‌kg of ethanol.
Molecular weight of ethanol =46.07g∕mol
Number of moles of ethanol
=

Weight‌of‌ethanol

Molecular‌weight‌of‌ethanol

=

1000g

46.07g∕mol

=21.70‌mol
∴ Mole fraction of solute =

1‌mol

1‌mol+21.70‌mol

=

1‌mol

22.70‌mol

=0.044
Hence, mole fraction of solute is 0.044.