boiling point of SiH4 vs SiCl4

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boiling point of SiH4 vs SiCl4

Postby Guzman_1J » Sun Dec 08, 2019 4:27 am

Is the reason SiCl4 has a higher boiling point that they have stronger dispersion forces? They are both nonpolar molecules, which means their dipole-dipole forces cancel out, this has an effect on boiling point or what is the reason for this?

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Re: boiling point of SiH4 vs SiCl4

Postby Chem_Mod » Sun Dec 08, 2019 10:04 am

You are correct; since the dipoles cancel out, they each have only London forces. SiCl4, Cl is larger and thus more electron dense than H, so London forces between SiCl4 molecules are stronger, making it take more energy to be boiled and become gaseous

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