Refer to Figure 11.8 to answer the following questions:
(a) Of the three hydrogen halides (HX), which has the largest total intermolecular force?
(b) Why are the dispersion forces greater for HI than for HCl?
(c) Why are the dipole–dipole forces greater for HCl than for HI?
(d) Of the seven molecules in Figure 11.8, which involves the largest dispersion forces? Explain why this is reasonable.

Data given in Figure 11.8

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Energy (kJ/mol) 50 45 40 35 30 25 20 15 10 5 0 Ar Dipole-dipole force London dispersion force 8 CO HI ☐Dipole/induced dipole force Total force HBr HCL NH3 H₂O