Development of the Modern Freezer. Bacteria are usually the cause of food decay, but they can't grow as well or at all in freezing temperatures, which are at 32 degrees Fahrenheit (0 degrees Celsius) or lower.
HF- polar molecule: dipole-dipole forces. There are also dispersion forces and H bond between HF. BF3- nonpolar: dispersion forces. Ar- Dispersion forces between Ar atoms.
Best Answer: The simple answer is because HF has stronger intermolecular forces of attraction than HCl does. Since the molecules are more strongly attracted, they have to have a greater average kinetic energy in order for them to escape as a gas.