Which of the following substances would have the greatest dispersion forces h2 o2 cl2 br2 i2 i2

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Explanations:- All these given molecules are nonpolar as the bond is between two similar atoms. The type of dispersion forces present in non polar molecules are London dispersion forces also written as LDF.

London dispersion forces becomes stronger as the molar mass if the compound increases. In all the given molecules, the molar mass of iodine is higher and for this reason the dispersion forces are also greatest in iodine.

The difference between temperature and thermal energy is that the thermal energy of an object is worked out by adding up the kinetic energy of all molecules whereas temperature is the average of kinetic energy of the molecules.

Thermal energy- adding up.
Temperature - average.
Hope this helps!!