11. One kilogram of liquid water at 100° C and 1 atm is vaporized to steam at the same temperature. The latent heat of vaporization of water is 2.3 × 10⁶ J/kg. The steam density at 1 atm is 0.6 kg/m³, and 1 atm is 1.0 × 10⁵ N/m². The volume of liquid water is negligible when compared with that of steam. What is the increase of internal energy?
(A) 2.1 × 10⁶ J
(B) 2.3 × 10⁶ J
(C) 2.5 × 10⁶ J
(D) 4.0 × 10⁶ J
(E) 1.7 × 10⁵ J