The vapor pressure of SnCl₄ reaches 400 mm Hg at 92 °C, the vapor pressure of SnI₄ reaches 400 mm Hg at 315 °C, the vapor pressure of PBr₃ reaches 400 mm Hg at 150 °C, and the vapor pressure of PCl₃ reaches 400 mm Hg at 57 °C. At 175 °C which substance would have the lowest vapor pressure?

Question

Quizplus · Accepted Answer

The substance with the highest temperature for a given vapor pressure (in this case, 400 mm Hg) will have the lowest vapor pressure at a lower temperature (175 °C) because it indicates a lower volatility. SnI₄ reaches 400 mm Hg at 315 °C, which is the highest temperature among the given substances, suggesting it has the lowest vapor pressure at 175 °C.

The Vapor Pressure of SnCl4 Reaches 400 Mm Hg at 92

The Vapor Pressure of SnCl₄ Reaches 400 Mm Hg at 92