# How do you determine lowest boiling point?

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Intermolecular forces (IMFs) can be used to predict relative boiling points. The stronger the IMFs, the lower the vapor pressure of the substance and the higher the boiling point. Therefore, we can compare the relative strengths of the IMFs of the compounds to predict their relative boiling points.

## How do you know which compound has the lowest boiling point?

The one with the weakest IMF will have the lowest boiling point. CH4 has only dispersion forces while all the others have dispersion PLUS either dipole-dipole (HCl, H2S, NH3), and/or hydrogen bonding (NH3). So, CH4 will have the lowest boiling point.

## Which is the lowest boiling point?

The element with the lowest boiling point is helium.

## How do you determine which boiling point is higher?

First there is molecular size. Large molecules have more electrons and nuclei that create van der Waals attractive forces, so their compounds usually have higher boiling points than similar compounds made up of smaller molecules.

## How do you determine boiling point?

The Formula for Boiling Point

It are often calculated as: Kb = RTb2M/ΔHv, R is that the universal gas constant. Tb is that the boiling temperature of the pure solvent [in K] M is that the molar mass of the solvent.

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## Which of the substances above has the lowest boiling point?

Atmosphere. Nitrogen (N2), carbon dioxide, oxygen (O2), helium, chlorine (Cl2) and hydrogen are all familiar examples of substances that boil at much lower temperatures than water. Liquid helium has the lowest boiling point of all — about -452 degrees Fahrenheit, only 4.2 degrees Celsius above absolute zero.

## Which compound would you expect to have the lowest boiling point Why?

KCl has the lowest boiling point. The lowest boiling point is due to the following reasons. Size of potassium and Cl is large.

## Which has the lowest boiling point in group 15?

Hence, among group 15 hydrides, phosphine has the lowest boiling point.

## Which has the lowest melting point?

The chemical element with the lowest melting point is Helium and the element with the highest melting point is Carbon. The unity used for the melting point is Celsius (C).

## Which compound has the lowest boiling point quizlet?

CO2 is a nonpolar molecular compound. The only intermolecular force present is a relatively weak dispersion force (small molar mass). CO2 will have the lowest boiling point.

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