At 20°C the Vapor Pressure of Dry Ice Is 56

At 20°C the vapor pressure of dry ice is 56.5 atm. If 100 g of dry ice is place in an evacuated 0.5 L chamber at a constant temperature of 20°C, how many grams of solid will sublime?

A) 0.0872 g
B) 10.1 g
C) 28.1 g
D) 51.7 g
E) 100 g