Place the following substances in order of increasing vapor pressure at a given temperature. SF₆ SiH₄ SF₄ A) SF₆

Question

Place the following substances in order of increasing vapor pressure at a given temperature. SF₆ SiH₄ SF₄ A) SF₆ < SiH₄ < SF₄ B) SiH₄ < SF₄ < SF₆ C) SF₆ < SF₄ < SiH₄ D) SF₄ < SF₆ < SiH₄ E) SiH₄ < SF₆ < SF₄

Quizplus · Accepted Answer

The vapor pressure of a substance increases with increasing temperature and decreasing molecular weight. The molecular weight of SiH₄ is less than SF₄, and the molecular weight of SF₄ is less than SF₆. Therefore, the order of increasing vapor pressure is SF₄ < SF₆ < SiH₄, which corresponds to choice D.

Place the Following Substances in Order of Increasing Vapor Pressure