A 25-liter sample of steam at 100°C and 1.0 atm is cooled to 25°C and expanded until the pressure is 19.71 mm Hg. If no water condenses, calculate the final volume of the water vapor.

A. 240 L
B. 770 L
C. 1.0 L
D. 1.3 x 10 -3 L