Spontaneity of Solid Phase Change Two crystalline forms of white phosphorus are
ID: 1017443 • Letter: S
Question
Spontaneity of Solid Phase Change
Two crystalline forms of white phosphorus are known. Both forms contain P4 molecules, but the molecules are packed together in different ways. The form is always obtained when the liquid freezes. However, below -76.9 °C, the form spontaneously converts to the form.
Indicate which of the following statements are true or false, with regard to the above process.
true false Above -76.9°C, the sign of G for this process is negative.
true false The phase has the more ordered crystalline structure.
true false The sign of S for this process is negative.
true false The sign of H for this process is positive.
true false At -76.9°C, G for this process is greater than zero.
true false At -76.9°C, both solid phases can coexist indefinitely.
Explanation / Answer
Above -76.9°C, the sign of G for this process is negative - True.
Because the process is contineous
The phase has the more ordered crystalline structure - False
beta - form has more ordered crystalline structure.
The sign of S for this process is negative - True
Since temperature is decreasing, S for the process is negative.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.