Question

At a given temperature and pressure nitrogen gas is more soluble in water than helium gas. Which one of them has a higher value of $K_H$?

Answer 1

$S=K_{H}P$

$S=$ solubility in mol/L (or M)

$K_H=$ Henry's law constant (unit mol/(L atm) or M/atm.
Assume pressure to be 1 atm.

Nitrogen gas is more soluble in water than helium gas

$S_{N_2}>S_{He}$

$P_{N_2}=P_{He}$

$K_{H,N_2}=\frac{S_{N_2}}{P_{N_2}}$

$K_{H,He}=\frac{S_{He}}{P_{He}}$

$K_{H,N_2}>K_{H,He}$

Nitrogen has a higher value of $K_H$ than helium.