<span>P<span>F5
</span></span><span> has a zero dipole moment as it doesn't have a lone pair of electrons. the geometry is trigonal bipyramidal. The axial P-F bonds "cancel" each other. The equatorial P-F bonds are oriented as trigonal planar, so those three (like in BF3) "cancel" as well.
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Dipole moment of a compound is different from the dipole moment of a bond. You need to look at ALL bonds for the overall dipole moment of a molecule.
Answer:
The heat of reaction is basically the energy that is being released and or absorbed when chemicals are transformed in a type of chemical reaction. However, the heat of reaction or also called reaction enthalpy is mostly or typically expressed as a molar enthalpy in kJ/mol and or as just a specific enthalpy in kJ/kg or kJ/L.