Two crystalline forms of white phosphorus are known. Both forms contain P_4 mole

Question

Two crystalline forms of white phosphorus are known. Both forms contain P_4 molecules, but the molecules are packed together in different obtained when the liquid freezes. However, below -76.9 degree C, the a form spontaneously converts to the beta form. P_4(s, a) rightarrow P_4(s, beta) Indicate which of the following statements are true or false, with regard to the above process. The sign of Delta S for this process is positive. Above -76.9 degree C, the sign of Delta G for this process is negative. At -76.9 degree C, Delta G for this process is less than zero. The sign of Delta H for this process is positive. At -76.9 degree C, both solid phases can coexist indefinitely. The beta phase has the more ordered crystalline structure.

Explanation / Answer

T < -76.9°C; beto forms

dG = dH - T*dS

a)

Beta system will be more odered, since it is low T, then entoy of system must be lowering

b)

dG must be positive for this prcess, in order for it to be nonspontaneous

c)

True, dG must be negative

d)

dH --> must be positive, so dS is negative and dG overall is ngative

e)

True, since that is the temperature in equilbirium, so you can have % arangment between a and b

f

True, since it has lower T, more entropy as wel

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