Boiling Points....

I have no idea on this..

The chloro-flurocarbon CCl2F2, commercially known as "Freon II" , and ammonia are both used extensively as refrigerant gases. Freon boils at -30C whereas ammonia boils at -33C. Explain why the boiling points are similar eventhough the molecular mass of freon is more than seven times that of ammonia.

Explain why ammonia is a base but methane is regarded as neither acidic nor basic.
Could it be: "Ammonia is a base and accepts protons. Methane is neither acidic or basic as it cannot donate or accept protons"??

Reply 1

Mustard-man

18

galadriel100

Explain why ammonia is a base but methane is regarded as neither acidic nor basic.
Could it be: "Ammonia is a base and accepts protons. Methane is neither acidic or basic as it cannot donate or accept protons"??

Yes, ammonia accepts protons because it has a lone pair of electrons, therefore forming a dative covalent bond with a H ion.

Reply 2

Mustard-man

18

galadriel100

I have no idea on this..

The chloro-flurocarbon CCl2F2, commercially known as "Freon II" , and ammonia are both used extensively as refrigerant gases. Freon boils at -30C whereas ammonia boils at -33C. Explain why the boiling points are similar eventhough the molecular mass of freon is more than seven times that of ammonia.

CCl2F2 has C-F and C-Cl bonds, the F and Cl are electronegative therefore forming dipole interactions (temporary)

Ammonia has permenant dipoles due to the lone pair, therefore forming partial charges as the dipoles do not cancel out. It also has H-bonds between the H and the N, H-bonds are the strongest of the simple molecular forces.

So CCl2F2 may have a bigger molecular mass, but ammonia has strong bonds to compensate as it were.

Boiling Points....

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