The Henry's Law Constant for N₂ in Water at 25 $\circ$

The Henry's law constant for N₂ in water at 25 ^$\circ$ C is 6.0 $\times$ 10^-4 mol/kg.bar.What is the equilibrium concentration of N₂ in water when the partial pressure of N₂ is 586 mm Hg? (760 mm Hg = 1 atm = 0.9869 bar)

A) 1.4 $\times$ 10^-9 M
B) 1.8 $\times$ 10^-5 M
C) 4.6 $\times$ 10^-4 M
D) 7.7 $\times$ 10^-4 M
E) 7.9 $\times$ 10^-4 M