HW 2.25 part a

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abbydouglas1K
Posts: 65
Joined: Fri Sep 28, 2018 12:26 am

HW 2.25 part a

Postby abbydouglas1K » Thu Nov 08, 2018 10:37 am

Question: Which bond is longer ? The CN bond in HCN or in H3CNH2? I know that bond lengths tend to correspond with atomic radius size but does the addition of the extra hydrogens make the molecule necessarily larger?

Emmaraf 1K
Posts: 94
Joined: Sat Oct 20, 2018 12:16 am

Re: HW 2.25 part a

Postby Emmaraf 1K » Thu Nov 08, 2018 11:00 am

If I recall correctly, the HCN has a triple bond between the C and N while the other molecule only has a single bond. Single bonds are longer/weaker than triple bonds.

Kim Tran 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:24 am

Re: HW 2.25 part a

Postby Kim Tran 1J » Thu Nov 08, 2018 1:12 pm

The CN bond in H3CNH2 is longer. If you were to draw out the Lewis structures, CN in HCN forms a triple bond, while CN in H3CNH2 forms a single bond. As the number of bonds increases between atoms, the length of the bond becomes shorter. So a single bond would be longer than a triple bond.

Bond lengths and the number of bonds present are inversely proportional.

abbydouglas1K
Posts: 65
Joined: Fri Sep 28, 2018 12:26 am

Re: HW 2.25 part a

Postby abbydouglas1K » Fri Dec 07, 2018 12:13 am

Thank you so much!


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