AL physical chem

2010-01-01 8:45 pm

the bond angel between two N-H bonds in NH3 is greater than that between two P-H bonds in PH3 , why ?

this can be explained by stating that bonds in NH3 are monre polar than that of P-H bonds . however what it has to do about polar bond ?

回答 (1)

老爺子

2010-01-01 9:27 pm

✔ 最佳答案

N atom has a much higher electronegativity than H atom, and thus N-H bond is very polar with a partial positive charge located on H atom and a partial negative charge located on N atom.

P atom and H atom have similar electronegativity, and thus the polarity of P-H bond is very low. Therefore, the charge located on H atom or N atom is negligible.

Compare the bond angle in NH3 and PH3 molecules. There is a stronger repulsion between the partially positive-charged H atoms in NH3 than that between the nearly neutral H atoms in PH3. As a result, the bond angle in NH3 molecule is greater than that in PH3 molecule.

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