Determine the kinds of intermolecular forces that are present in each element or compound. a. PH₃ b. HBr

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1. Identify the types of intermolecular forces: London dispersion forces, dipole-dipole interactions, and hydrogen bonding.
2. For PH_3: Recognize that PH_3 is a polar molecule due to the difference in electronegativity between P and H, leading to dipole-dipole interactions. Also, note that PH_3 does not have hydrogen bonding because hydrogen is not bonded to N, O, or F.
3. For PH_3: Acknowledge that all molecules, including PH_3, exhibit London dispersion forces due to temporary dipoles.
4. For HBr: Determine that HBr is a polar molecule because of the electronegativity difference between H and Br, resulting in dipole-dipole interactions.
5. For HBr: Understand that HBr also exhibits London dispersion forces, as these are present in all molecules.