Final answer:
Br₂ has higher vapor pressure at a given temperature due to weaker intermolecular forces.
Step-by-step explanation:
The substance with the higher vapor pressure at a given temperature is the one with weaker intermolecular forces. In this case, Br₂ has higher vapor pressure compared to I₂. This is because Br₂ has weaker intermolecular forces (London dispersion forces) due to the larger size and greater number of electrons. This results in easier vaporization of Br₂ and therefore higher vapor pressure.
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