5. Two white crystalline forms of phosporus. Both forms contain P4 moleculesbut the molecules are packed together in different ways. The α forms isalways obtained when the liquid freeze. However, below −76.9◦C, the α forms spontaneously convert into β form:P4(s,α) → P4(s,β)(a) Predict the signs of ∆H and ∆S for this process.(b) Predict which form of phosphorus has the more ordered crystallinestructure (has the smaller positional probability).
5. Two white crystalline forms of phosporus. Both forms contain P4 moleculesbut the molecules are packed together in different ways. The α forms isalways obtained when the liquid freeze. However, below −76.9◦C, the α forms spontaneously convert into β form:P4(s,α) → P4(s,β)(a) Predict the signs of ∆H and ∆S for this process.(b) Predict which form of phosphorus has the more ordered crystallinestructure (has the smaller positional probability).
Chapter17: Spontaneity, Entropy, And Free Energy
Section: Chapter Questions
Problem 3RQ: What determines Ssurr for a process? To calculate Ssurr at constant pressure and temperature, we use...
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5. Two white crystalline forms of phosporus. Both forms contain P4 molecules
but the molecules are packed together in different ways. The α forms is
always obtained when the liquid freeze. However, below −76.9
◦C, the α
forms spontaneously convert into β form:
P4(s,α) → P4(s,β)
(a) Predict the signs of ∆H and ∆S for this process.
(b) Predict which form of phosphorus has the more ordered crystalline
structure (has the smaller positional probability).
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