Problem: Which member of the following pairs has the larger London dispersion forces?H2O or H2SCO2 or COCH4 or SiH4

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All compounds exhibit London dispersion forces → primary IMF of nonpolar compounds

  • For same type of IMF:
    • smaller molar mass weaker IMF
    • bigger molar massstronger IMF
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Problem Details

Which member of the following pairs has the larger London dispersion forces?

H2O or H2S

CO2 or CO

CH4 or SiH4

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What scientific concept do you need to know in order to solve this problem?

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