Abstract
The vaporization behavior of AgP 2(s) and Au 2P 3(s) has been studied by mass loss effusion, from graphite and glass cells, in the respective temperature ranges 521 – 639 K and 646 – 773 K. The vaporization of Au 2P 3 is severely retarded, while that of AgP 2 is retarded somewhat less. Equilibrium pressures of P 4 obtained in both systems, when combined with other pressure data from the literature, lead to: 2AgP 2(s) = 2Ag(s) + P 4(g), ΔH° 600 = 33.1 ± 2.0 kcal ΔS° 600 = 40.0 ± 2.4 cal deg −1 4 3 Au 2 P 3( s) = 8 3 Au( s) + P 4( g) , ΔH° 740 = 44.3 ± 2.0 kcal ΔS° 740 = 45.6± 2.4 cal deg −1. Combination of these data with the published enthalpy of formation of P 4(g) and estimated heat capacities gives the following enthalpies of formation at 298.15 K: AgP 2(s), −1.8 ± 1.2 kcal mole −1, and Au 2P 3(s), −11.6 ±2.0 kcal mole −1 (relative to red phosphorus as the standard state).
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