Question

what happens when you decrease the pressure from 150 kPa to 50 kPa on liquid water at 100 ºC?
a.The liquid water condenses.
b.The liquid water freezes.
c.The water remains liquid.
d.The liquid water vaporizes

Answer 1

D. liquid water vaporizes. 

I have attached a phase diagram for water. As you can see, if kPa is 50, and the temperature is 100c. it is in the vapor phase.