A Bourdon spoon gauge was employed to measure the vapor pressure of phosphorus between 373 and 1423 K. Between 573 and 973 K, the pressure obeyed the ideal gas law, indicating P4 to be predominant. Above 1073 K, measured pressures deviated from the law, and the pressures of P2 and P4 were separated from each other to calculate the equilibrium constant Kp for these vapor species. Below 475 K, liquid phosphorus was observed to condense, and the measurements yielded the vapor pressure pp4 over liquid phosphorus. The third law method was employed to calculate ΔH2980 for the two equilibria and to express Kp and pp4 in best fit equation of temperature.
No takes yet. Share an insight, caveat, or question.
Arita et al. (1985) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: