What Determines the Strength of Forces Between Particles?

[omni]

Is it true that the Forces between particles determined as follows:
1)Molar mass
2)Polarity
3)Surface area
?


like if i have KBr and SO3 i know that the Forces between particles in KBr is much stronger.
Because KBr have more Molar mass then SO3 and more Polarity.

am i Right?

thnaks.

 

[Kracatoan]

Forces between particles cannot really be classified by those 3 characteristics you have written. It is best thinking of it in terms of the 3 main forces, Van der Waals, Dipole-Dipole and Hydrogen bonding. In general stuff with hydrogen bonds (0-H,N-H,F-H) will have stronger forces between the molecules than substances with either of the two forces, Van der Waals being the weakest. If you want to compare intermolecular force strength, your best bet is to see which has the storngest type of bond, and if they have the same type of bond, which has the most. If nether is hydrogen or dipole-dipole bonded, then yes, the one with the greatest molecular mass (and hence, usually, surface area) will have the strongest intermolecular forces.

 

[omni]

thnaks for answer.