Chapter 10, Problem 106AE

Two crystalline forms of white phosphorus are known.Both forms contain ${\text{P}}_{\text{4}}$ molecules, but the molecules arepacked together in different ways. The aform is alwaysobtained when the liquid freezes. However, below-76.9°C, the aform spontaneously converts to the $\beta$ form:
$\text{P}4(s,\alpha )\to \text{P}4(s,\beta )$
a. Predict the signs of $\Delta H\text{and}\Delta S$ for this process.
b. Predict which form of phosphorus has the moreordered crystalline structure (has the smaller positionalprobability).