# Question

Two crystalline forms of white phosphorus are known. Both forms contain P4 molecules, but the molecules are packed together in different ways. The a form is always obtained when the liquid freezes. However, below 276.9oC, the a form spontaneously converts to the b form:

P4(s,a) → P4(s,b)

a. Predict the signs of ΔH and ΔS for this process.

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

P4(s,a) → P4(s,b)

a. Predict the signs of ΔH and ΔS for this process.

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

## Answer to relevant Questions

In the text the equation ΔG = ΔGo + RT ln(Q) was derived for gaseous reactions where the quantities in Q were expressed in units of pressure. We also can use units of mol/ L for the quantities in Q— specifically for ...Using the following data, calculate the value of Ksp for Ba(NO3)2, one of the least soluble of the common nitrate salts. Calculate the changes in free energy, enthalpy, and entropy when 1.00 mole of Ar(g) at 27oC is compressed isothermally from 100.0 L to 1.00 L. You have a 1.00- L sample of hot water (90oC) sitting open in a 25oC room. Eventually the water cools to 25oC, whereas the temperature of the room remains unchanged. Calculate ΔSuniv for this process. Assume the density of ...Calculate ΔHo and ΔSo at 25oC for the reaction 2SO2(g) + O2(g) → 2SO3(g) at a constant pressure of 1.00 atm using thermodynamic data in Appendix 4. Also calculate ΔHo and ΔSo at 227oC and 1.00 atm, assuming that the ...Post your question

0