Question

$'K'$ is Henry’s constant and has the unit

• A. $atm\, mol^{-1}\, dm^3$
• B. $mol^{-1}\, dm^3\, atm^{-1}$
• C. $atm\, mol\, dm^{-3}$
• D. $mol \,dm^{-3}\, atm^{-1}$

Answer 1

Answer: (D)

According to Henry's "the partial pressure of the gas in vapour phase $(p)$ is proportional to the mole fraction of the gas $(\chi)$ in the solution". It is expressed as

$p \propto \chi \text { or } p=K_{H} X$

where, $K_{ H }=$ Henry's law constant Its unit is $M \mid$ atm or $m o l d m^{-3} a t m^{-1}$.