Problem: Two crystalline forms of white phosphorus are known. Both forms contain P4 molecules, but the molecules are packed together in different ways. The α form is always obtained when the liquid freezes. However, below -76.9°C, the α form spontaneously converts to the β form:P4 (s, α) → P4 (s, β)b. Predict which form of phosphorus has the more ordered crystalline structure (has the smaller positional probability).

FREE Expert Solution

P4 (s, α) → P4 (s, β)

transition from α to β occurs at low temperature (-76.9°C) → lesser entropy at lower temperature

α form is always obtained when the liquid freezes → larger positional probability

91% (494 ratings)
View Complete Written Solution
Problem Details

Two crystalline forms of white phosphorus are known. Both forms contain P4 molecules, but the molecules are packed together in different ways. The α form is always obtained when the liquid freezes. However, below -76.9°C, the α form spontaneously converts to the β form:

P4 (s, α) → P4 (s, β)

b. Predict which form of phosphorus has the more ordered crystalline structure (has the smaller positional probability).

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Boltzmann Equation concept. If you need more Boltzmann Equation practice, you can also practice Boltzmann Equation practice problems.

What textbook is this problem found in?

Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.