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

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

Vapor pressure increases with decreasing molecular weight and increasing temperature. The molecular weight of SiH₄ is the lowest among the three, so it has the highest vapor pressure. Between SF₆ and SF₄, SF₆ has the lower vapor pressure because it has a higher molecular weight. Therefore, the correct order is SF₄ < SF₆ < SiH₄.

Place the Following Substances in Order of Increasing Vapor Pressure