Line structure chemistry calculator series#

Share the cost with some friends, keep it in good condition and don't lose any bits, and resell it via eBay or Amazon at the end of your course.Īlternatively, get hold of some coloured Plasticene (or other children's modelling clay) and some used matches and make your own. Google molymod to find a supplier and more about them, or search for molymod on Amazon. An introductory organic set is more than adequate. The models made by Molymod are both cheap and easy to use. If your school or college hasn't given you the opportunity to play around with molecular models in the early stages of your organic chemistry course, you might consider getting hold of a cheap set. Note: This is all much easier to understand if you have actually got some models to play with. One structure is in reality a simple rotation of the other one. But these two structures are actually exactly the same. The chlorines could be opposite each other or at right angles to each other. You might think that there were two different ways of arranging these atoms if you drew a displayed formula. This mismatch between what you draw and what the molecule actually looks like can lead to problems if you aren't careful.įor example, consider the simple molecule with the molecular formula CH 2Cl 2. Notice that the way the methane is drawn bears no resemblance to the actual shape of the molecule. You need to remember that each line represents a pair of shared electrons.įor example, this is a model of methane together with its displayed formula: There are various ways of drawing this and you will need to be familiar with all of them.Ī displayed formula shows all the bonds in the molecule as individual lines. In cases like this, the bonding in the organic molecule isn't important.Ī structural formula shows how the various atoms are bonded. About the only place where you might come across them is in equations for the combustion of simple hydrocarbons, for example: Molecular formulae are very rarely used in organic chemistry, because they don't give any useful information about the bonding in the molecule. a pollution of 1 gram of benzene in a certain amount of water converts to N A/78.11≈ 7.This page explains the various ways that organic molecules can be represented on paper or on screen - including molecular formulae, and various forms of structural formulae.Ī molecular formula simply counts the numbers of each sort of atom present in the molecule, but tells you nothing about the way they are joined together.įor example, the molecular formula of butane is C 4H 10, and the molecular formula of ethanol is C 2H 6O. Using the above calculator you could find that e.g. Or 1 mole of a substance will contain Avogadro's number of that substance. The term ' mole' is defined in that one mole of a substance with a molecular (or atomic) mass of one (1), will have a mass of 1 gram. It is defined to be 1/12 of the mass of one atom of carbon-12 and in older works is also abbreviated as 'amu'.Īlso, important in this field is Avogadro's number (N A) or Avogadro's constant (6.0221 x 10 23). In related terms, another unit of mass often used is Dalton (Da) or unified atomic mass unit (u) when describing atomic masses and molecular masses. Molecular mass or molar mass are used in stoichiometry calculations in chemistry. This Calculator has been tested on Internet Explorer version 6 only,įirefox might not show all fields correctly. For question or remarks please contact us. !!! Lenntech BV cannot be held responsible for errors in the calculation, Make sure you enter the molecule of crystallization at last (e.g.

The calculator handles at most two different bracket levels. The molecular mass calculator will recognize the entered formula's, which are included in the list of organic compounds.

Line structure chemistry calculator series#

Or you can choose by one of the next two option-lists, which contains a series of common organic compounds (including their chemical formula) and all the elements. This online calculator you can use for computing the average molecular weight (MW) of molecules by entering the chemical formulas (for example C3H4OH(COOH)3 ). Molecular Weight Calculator Molecular Weight Calculator

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