Josie observed that when water is boiled in an open beaker it completely disappears, leaving the beaker dry. what can josie conclude? a) mass is created in this experiment. b) mass is destroyed in this experiment. c) the mass of water is equal to the mass of water vapor produced. d) for the mass of water to be conserved during boiling, the beaker must be closed.

D) the Mass of water needs to be in a closed system to control the boiling. With an open system, you can no longer measure the water vapor output and be sure that the water vapor in the bottle is equal to the water vapor in the air or beyond. It is only through the closed system that you can measure the volume, the mass difference and ensure that both are in equilibrium