Chemistry Question: Intermolecular Forces

MortellarPreMed

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How do you determine which molecules have stronger intermolecular forces in comparriosn to each other.

For example:

CO2 or OCS

SeO2 or SO2

An explanation as to why which one would have a stronger intermolecular forces would be much appreciated.
 

matanpucla

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How do you determine which molecules have stronger intermolecular forces in comparriosn to each other.

For example:

CO2 or OCS

SeO2 or SO2

An explanation as to why which one would have a stronger intermolecular forces would be much appreciated.

in the case of SeO2 v SO2 SeO2 is stronger, because the only difference is the central atom Se vs S, and Se is larger, therefore you get more dispersion.

i think in the case of CO2 v OCS, OCS is stronger because it is more polar. but not quite 100 percent on that one.
 

MortellarPreMed

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in the case of SeO2 v SO2 SeO2 is stronger, because the only difference is the central atom Se vs S, and Se is larger, therefore you get more dispersion.

i think in the case of CO2 v OCS, OCS is stronger because it is more polar. but not quite 100 percent on that one.

I know youre right about SeO2 v SO2,why does the size of the atom (Se) make a difference in intermolecular forces?
 
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dsoz

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in the case of SeO2 v SO2 SeO2 is stronger, because the only difference is the central atom Se vs S, and Se is larger, therefore you get more dispersion.

i think in the case of CO2 v OCS, OCS is stronger because it is more polar. but not quite 100 percent on that one.

CO2 has polar bonds, but a net zero dipole moment because of the vector forces cancel out. Therefore the molecule is non-polar.

OCS is polar because the C=S bond is less polar than the C=O bond, so there is a net polarity to the molecule. This makes it have greater intermolecular forces.

HTH

dsoz
 

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How do you determine which molecules have stronger intermolecular forces in comparriosn to each other.

For example:

CO2 or OCS

SeO2 or SO2

An explanation as to why which one would have a stronger intermolecular forces would be much appreciated.

You ask your professor or consult your MCAT books.

Sent from my SGH-T999 using SDN Mobile
 
in the case of SeO2 v SO2 SeO2 is stronger, because the only difference is the central atom Se vs S, and Se is larger, therefore you get more dispersion.

i think in the case of CO2 v OCS, OCS is stronger because it is more polar. but not quite 100 percent on that one.

Both questions can be explained similarly. As someone mentioned, SDN isn't for homework help.
 
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