Which Liquid Would Form the Densest Vapor Upon Heating?

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Discussion Overview

The discussion revolves around identifying which liquid would produce the densest vapor upon heating, focusing on the properties of various organic compounds and their vapor pressures. The scope includes theoretical reasoning and comparisons of molecular characteristics.

Discussion Character

  • Homework-related
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • One participant asserts that the answer is C (CH3(CH2)4CH2Br) due to its molar volume being roughly the same at standard conditions.
  • Another participant argues that B (CH3(CH2)3CH2Cl) should be considered because it is the lightest and has the least intermolecular forces, potentially leading to a higher vapor pressure.
  • A later reply questions whether the original question is asking about the density of vapor produced from equal volumes of each liquid, noting the differences in intermolecular forces and molecular weights.
  • One participant suggests that while different pressures of saturated vapor exist, it may not be sufficient information to determine which vapor is densest, especially given the opposing effects at play.
  • Another participant acknowledges the importance of considering these factors in future questions.

Areas of Agreement / Disagreement

Participants express differing views on which liquid would produce the densest vapor, with no consensus reached on the reasoning behind their choices.

Contextual Notes

Participants highlight the need to consider intermolecular forces and molecular weights, as well as the conditions under which vapor pressures are compared, indicating potential limitations in the information provided.

mayer
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Homework Statement


Which of the following liquids would form the densest vapor upon heating?
A. CH3CH2CH2OH
B .CH3(CH2)3CH2Cl
C. CH3(CH2)4CH2Br
D. (CH3)3CCH2OH

Homework Equations


None really

The Attempt at a Solution


Now I know the answer already, its C. My question is why? I got B, my reasoning was that it is the lightest and has the least inter-molecular forces, which would result in a higher vapor pressure at a given temperature. Now the solution states it is C because at standard conditions, the molar volume is roughly the same. Does this mean, at the same temperature and pressure, the vapor pressure above each solution will be roughly the same?
 
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Which gas is more dense: hydrogen, or sulfur hexafluoride?
 
That would be sulfur hexafluoride. But my confusion is that in the question, the molecules are liquids and are producing vapor while still in the liquid phase. So is the question that I posted asking about which vapor is densest when both are produced to equal volume? Don't they have different imf and M.W. so that each liquid produces different amounts of vapor pressure at a given temperature?
 
Different pressures of the saturated vapor for sure, but I don't think you have enough information to judge that (especially when there are opposite effects at work). Approach based just on the molar mass is easy to defend - you compare things assuming everything else is identical.
 
Ah I see, that'll be important to consider in future questions. Thanks!
 

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