Question

VERY IMPORTANT PLEASE PLEASE HELP ME
During an experiment, solid iodine was placed in a sealed container. The container was gradually heated and purple-colored vapors of iodine formed were observed. Describe this system when it reaches phase equilibrium.

Answer 1

Answer:

solid iodine, (I2 )

only underwent sublimation when heated at atmospheric pressure. I was so wedded to this idea that I performed the demonstration for years. A small beaker containing a few grams of iodine, when heated in a fume hood

phase diagram of iodine. Among the few I found, two had significant errors. So I prepared the one shown in Mike’s article at left. As Mike notes, iodine can indeed be a liquid at atmospheric pressure between 113.7 oC and 184.3 oC            

     

Answer 2

Answer: It converts solid iodine to purple-iodine vapors directly. This process is known as the sublimation process.

Explanation: The sealed container is a closed system - no reactant or product can enter or leave the flask.