Question

'K' is Henry's constant and has the unit ______.

Options

• atm mol^-1 dm³

• mol^-1 dm³ atm^-1

• atm mol dm^-3

• mol dm^-3 atm^-1

Answer 1

'K' is Henry's constant and has the unit mol dm^-3 atm^-1.

Explanation:

"The partial pressure of the gas in the vapour phase (p) is proportional to the mole fraction of the gas (χ), in the solution," according to Henry. It is written as

p ∝ χ or p = K_HX

where, K_H = Henry's law constant

Its unit is M |atm or mol dm^-3 atm^-1.