Henry's law constant of oxygen is 1.4×10⁻³ mol.lit⁻¹.atm⁻¹ at 298K. How much of oxygen is dissolved in 100ml at 298K when the partial pressure of oxygen is 0.5 atm?
A. 1.4g
B. 3.2g
C. 22.4mg
D. 2.24 mg