122ch11d - 38 11.72) See next page 39 11.72) (cont.) See...

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43 11.78) Which of the following pairs has the higher m.p. and why? a) HF HCl MW 20 36.5 molecular molecular polar polar LF < LF DD > DD H-bonding higher m.p. You would expect HF to have the stronger AF. HCl is larger so it has larger LF (but not that much larger). However, HCl is not as polar as HF and more importantly HF forms H bonds between HF molecules while HCl doesn’t. HF thus has stronger AF and higher m.p. b) C (graphite) CH 4 covalent network molecular nonpolar strong covalent bonds LF high m.p. low m.p. (gas at room temp.) C (graphite) is a covalent network solid. It has layers of C atoms covalently bonded in fused benzene type rings and the layers are held together by very strong London Forces. CH 4 is a small molecular compound. It is nonpolar and has only LF between CH 4 molecules. Thus the C(graphite) has a higher m.p. The CH 4 is a gas at room temperature.
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122ch11d - 38 11.72) See next page 39 11.72) (cont.) See...

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