Vapor Pressure of Antimony by the Torsion‐Effusion Method
Vapor Pressure of Antimony by the Torsion‐Effusion Method
复制标题
扭转喷射法测定锑的蒸气压
DOI：
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发表时间：
1961
期刊：
影响因子：
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通讯作者：
C. Birchenall
中科院分区：
文献类型：
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作者：
G. Rosenblatt;C. Birchenall
固体锑（420-550°C）和固体锌（250-335°C）上蒸气的压力和平均分子量已通过扭转动量和Knudsen重量损失法同时测量来确定。扭转测量用30°下的汞校准，使用通过并行重量损失实验确定的2.96×10 - 3 mm Hg的汞蒸气压。锌蒸气被证实是单原子的。锌压数据表示为logPmm=（8.741±0.218）-（6630±125）/T，根据热力学第二定律和第三定律计算的Δ H 298 °（vap）分别为30.73±0.57和31.18±0.12 kcal/mole，与文献报道的结果吻合良好。在实验误差范围内，固体锑上方的蒸气都是Sb 4分子。锑数据的最小二乘分析得出logPmm=（10.571±0.090）-（10 300±68）/T，压力比先前报告的低10%-40%。Sb_4（g）在298.16°K时的汽化热，按第二定律为49.83±0.31千卡/摩尔，按第三定律为49.45±0.09千卡/摩尔。
The pressures and mean molecular weights of the vapors over solid antimony (420–550°C) and solid zinc (250–335°C) have been determined by simultaneous measurements by the torsion‐momentum and Knudsen weight loss methods. The torsion measurement was calibrated with mercury at 30° using a mercury vapor pressure of 2.96×10‐3 mm Hg determined by concurrent weight loss experiments. Zinc vapor is confirmed to be monatomic. The zinc pressure data are represented by logPmm=(8.741±0.218) — (6630±125) /T giving ΔH298° (vap)=30.73±0.57 and 31.18±0.12 kcal/mole by the second law and third law of thermodynamics, respectively, in excellent agreement with previously reported results. The vapor over solid antimony is all Sb4 molecules within experimental error. Least‐squares analysis of the antimony data yields logPmm=(10.571±0.090) — (10 300±68) /T, pressures 10%‐40% lower than those previously reported. The heat of vaporization of Sb4(g) at 298.16°K is 49.83±0.31 kcal/mole by the second law and 49.45±0.09 by the third ...