Question

Answer this based on the the P-T phase diagram of CO₂: Describe quantitatively the changes in a given mass of solid CO₂ at 10 atm pressure and temperature -65° C as it is heated upto room temperature at constant pressure.

Answer 1

When solid CO2 at 10 atm and at – 65 °c is heated at constant pressure , the conversion an be explained as follows:

1. First it is converted into liquid .

2. On further heating it will go into vapour state.  

Reason :

The horizontal line corresponding to 10 atmp intersect the liquid and the vapour phase diagram of CO2