Two crystalline phases of white phosphorus are known. Both contain P4 molecules, but the molecules are packed together in different ways. The α phase of the solid (P4; density≅1.82 g/cm3) is always obtained when molten phosphorus crystallizes below the melting point (44.1 °C). However, when cooled below -76.9 °C, the α phase spontaneously converts to the β phase (P4; density≅1.88 g/cm3).
P4(s, α) P4(s, β)
Indicate which of the following statements are true or false, with regard to the above process.
Two crystalline phases of white phosphorus are known. Both contain P4 molecules, but the molecules are packed together in different ways. The a phase of the solid (P4; density = 1.82 g/cm³) is always obtained when molten phosphorus crystallizes below the melting point (44.1 °C). However, when cooled below -76.9 °C, the a phase spontaneously converts to the ẞ phase (P4; density=1.88 g/cm³). P4(s, a) P4(S, B) Indicate which of the following statements are true or false, with regard to the above process. true false true false negative. true The B phase has the less ordered crystalline structure. true The sign of AH for this process is negative. At -76.9°C, the two solid phases cannot coexist. At -76.9°C, AG for this process is zero. The sign of AS for this process is positive. Above -76.9°C, the sign of AG for this process is
Two crystalline phases of white phosphorus are known. Both contain P4 molecules, but the molecules are packed together i
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