Rank from highest to lowest melting points: CH3OH, BF3, Ar, HI, NaCl, HBr, MgS. And what is the reasoning?

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Rank from highest to lowest melting points: CH3OH, BF3, Ar, HI, NaCl, HBr, MgS. And what is the reasoning?

Thanks in advance!

2007-02-01 15:08:00 · 1 answers · asked by frogster99 2 in Science & Mathematics ➔ Chemistry

1 answers

Think of intermolecular forces. Dispersion forces being the weakest and ionic bonds the strongest.

MgS strong ionic bond(+2/-2 ion charges)
BF3 (+3/-1)
NaCl ionic bond (+1/-1)
CH3OH hydrogen bonding (NOF undergo hydrogen bonding)
HBr strong dipole-dipole force (electronegativities different)
HI dipole-dipole
Ar dispersion forces (the probability that electrons will concentrate in one area to form a momentary dipole)

2007-02-02 11:56:34 · answer #1 · answered by LGuard332 2 · 0⤊ 0⤋