AP EAPCET 25-Aug-2021 Shift 1 Paper

5 molar solution means there are 5 moles of KCl salt in 1L.
Molecular weight of KCl=74.55gmol−1
Hence, there are 5×74.55g in 1L of water
Density =

mass

volume

Mass of 1L of solution =1.26g∕mL×1000‌mL
= 1260 g
Mass of water in solution = Mass of solution- Mass of solute
=1260−372.75=887.25g
Mass of water in solution =0.887kg
Molality =

Number‌of‌moles‌of‌solute

Mass‌of‌solvent‌in‌kg

=

5

0.887

Molality =3.38m
Hence, molality of the solution is 3.38m.