How can I read molecular orbital diagram? As you know, a neutral carbon atom has a total of #6# electrons. A cylinder of propane C3H8 contains 16.00kg of liquefied gas. Bond order can be calculated easily from a molecular orbital diagram. The link below shows the MO diagram for C2, a species of carbon that has been identified in the gas phase. Catch our Q&A with Surrey Uni TODAY at 5pm, © Copyright The Student Room 2017 all rights reserved. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE, Hi I was just wondering what the bond order is for both C2^2- and C^2 as the answers that I am getting are 2 and 1. "# ion? Hi I was just wondering what the bond order is for both C2^2- and C^2 as the answers that I am getting are 2 and 1 the carbide ion has a bond order of 3, but there appears to be no bond at all in your second species! Here's what I got. around the world. The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd. Register Number: 04666380 (England and Wales), VAT No. Royal College of Art (RCA) Innovation Design Engineering (IDE) 2021 Applicants, EDEXCEL GCSE Chemistry 1CH0 - Paper 1 - 16th May 2019 [Unofficial Markscheme], How To Balance Cu + HNO3 = Cu(NO3)2 + NO + H2O, Edexcel AS/A Level Chemistry Student Book 1 Answers. The problem provides you with the MO diagram for the #"C"_2# molecule, so all you really have to do here is add an electron to that diagram. Also, an unpaired electron will make the #"C"_2^(-)# ion paramagnetic, i.e. 51474 views Tell us a little about yourself to get started.
The electron configuration of the neutral #"C"_2# molecule is -- I'll use the notation given to you in the diagram, #"C"_ 2: (1s_ (sigma))^2 (1s_ (sigma)^"*")^2 (2s_ (sigma))^2 (2s_ (sigma)^"*")^2 (2p_ (pi))^4#, The electron configuration of the #"C"_2^(-)# ion will be, #"C"_ 2^(-): (1s_ (sigma))^2 (1s_ (sigma)^"*")^2 (2s_ (sigma))^2 (2s_ (sigma)^"*")^2 (2p_ (pi))^4 color(red)((2p_ (sigma))^1#. Notice that because the extra electron is added to a bonding MO, the bond order of the #"C"_2^(-)# will actually be higher than the bond order of the neutral #"C"_2# molecule. As you can see in the diagram, the two #2p_(pi)# orbitals, let's say #2p_(pix)# and #2p_(piy)#, are the highest energy occupied molecular orbitals. (Start typing, we will pick a forum for you), Taking a break or withdrawing from your course, Maths, science and technology academic help, AQA GCSE Science New Spec All Past Papers & Mark Schemes, AQA further additional chemistry, C3, 15th June 2016 unofficial mark scheme, GCSE Chemistry Unit 2 and Unit 3 C2 C3 24th May 2012 Exam Discussion, A Level Maths & Further Maths Edexcel Module Order, OCR Gateway Chemistry B - C1 C2 C3 - Unofficial Mark Scheme, Last-minute A-level Chemistry revision: a crammer�s guide, 2021 entry Medicine A100 / A101 fastest and slowest offer senders, BMAT 2021 entry discussions megathread (Updated 20th October), Artful Lounger learns Sanskrit (among other things! Bond order is the number of chemical bonds between a pair of atoms and indicates the stability of a bond. What did you accomplish during the pandemic. Ask your questions now >>, Applying to uni? For example, in diatomic nitrogen, N≡N, the bond order is 3; in acetylene, H−C≡C−H, the carbon-carbon bond order is also 3, and the C−H bond order is 1. As for bond orders it is 1/2*[(#e- in bonding orbitals)-(#e- in antibonding orbitals)] Doing this, normally just C2 … The electrons in the bonding orbitals are identified as being in two pi bonding orbitals giving that molecule a bond order of 2. ), DWP Work Coach Executive Officer Interview, BSc Economics (2021 Entry) - International Students, Is studying llb law at a non Russel group uni worth it.

C2 is a component of carbon vapor. You can personalise what you see on TSR. The problem provides you with the MO diagram for the "C"_2 molecule, so all you really have to do here is add an electron to that diagram. 0. reply. How can I calculate the bond order of benzene? You need to add an electron and not remove one because of the overall negative charge that exists on the molecule.

The lowest energy unoccupied molecular orbital is #2p_(sigma)#, so that is where the extra electron will be added. We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out. See all questions in Molecular Orbital Theory. You need to add an electron and not remove one because of the overall negative charge that exists on the molecule.

), Join Uni of Surrey for a live Q and A on personal statements, live at 5pm TODAY! it is not attracted by an externally applied magnetic field. KCL 2021 Undergraduate Applicants Thread! So, where would this extra electron go in terms of molecular orbitals?

I won't show the calculation here because I'm not sure you're familiar with bond orders yet. The answer is C2- because of bond orders When we draw the C2 MO, we have everything up till the PiPy Orbitlal filled, and the next orbital tht would be filled would be the sigma2Pz orbital.
As you know, a neutral carbon atom has a total of 6 electrons. One paper estimates that carbon vapor is around 28% diatomic, but theoretically this depends on the temperature and pressure.


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