At a given temperature and a constant partial pressure, the mole fractions of four gases P , Q , R , and S dissolved in a solvent are 2 10⁻³ , 5 10⁻⁴ , 1 10⁻² , and 8 10⁻⁵ respectively. The correct increasing order of their Henry's law constants ( K _ H ) is :

Step-by-step solution

According to Henry's law, the partial pressure of a gas over a solution is given by p = K_H x , where K_H is Henry's law constant and x is the mole fraction of the gas in the solution. At a constant partial pressure, K_H is inversely proportional to the mole fraction x , i.e., K_H 1 x . The given mole fractions are: x_P = 2 10⁻³ x_Q = 5 10⁻⁴ = 0.5 10⁻³ x_R = 1 10⁻² = 10 10⁻³ x_S = 8 10⁻⁵ = 0.08 10⁻³ The increasing order of mole fractions is x_S Therefore, the increasing order of Henry's law constants is the reverse