Calculate the solubility of O₂ in water at a partial pressure of O₂ of 120 torr at 25°C. The Henry's Law constant for O2 is 1.3×10−3 mol/L-atm for Henry's Law in the form c=kp​⋅P, where c is the gas concentration (mol/L).

a) 9.23×10⁻² mol/L
b) 1.56×10⁻³ mol/L
c) 1.85×10⁻² mol/L
d) 2.31×10⁻³ mol/L