The triple point of H₂O is at 4.58 mmHg and +0.01 °C.Some H₂O at -50 °C is heated to 120 °C at a constant pressure of 0.5 atm.The changes of state occurring in this process are: A)solid to gas B)solid to liquid to gas C)liquid to gas D)solid to liquid E)gas to liquid to solid

Question

Quizplus · Accepted Answer

At -50 °C and 0.5 atm pressure, H₂O is in solid state. Heating it to 120 °C at a constant pressure of 0.5 atm will cause it to first melt and turn into liquid state at its melting point, then further heating will cause it to vaporize and turn into gas state at its boiling point. Therefore, the changes of state occurring in this process are solid to liquid to gas, which is described by option B.

The Triple Point of H2O Is at 4

The Triple Point of H₂O Is at 4