mphilippe Posted February 5, 2009 Share Posted February 5, 2009 I was wondering if I could get any help in sorting out the mollecular formula of dinoprostone based on looking at its stick figure. Thanks for the help! http://en.wikipedia.org/wiki/Dinoprostone Link to comment Share on other sites More sharing options...
John Cuthber Posted February 5, 2009 Share Posted February 5, 2009 That wiki page gives the molecular formula. Link to comment Share on other sites More sharing options...
mphilippe Posted February 5, 2009 Author Share Posted February 5, 2009 yes that's right but I would like to see how to count it from the stick figure Link to comment Share on other sites More sharing options...
hermanntrude Posted February 5, 2009 Share Posted February 5, 2009 each corner in the skeletal diagram is a carbon atom. the ends of lines are also carbon atoms. each carbon has enough hydrogens attached to make up its four bonds, although they aren't shown either, except when it's important to show them for some reason or other. Other atoms are shown as normal Link to comment Share on other sites More sharing options...
vedmecum Posted February 6, 2009 Share Posted February 6, 2009 yep !interesting problem . i think it is better to write in its simple form and then find the correct molecular formula . mine ans is C19H30O5. Link to comment Share on other sites More sharing options...
mphilippe Posted February 8, 2009 Author Share Posted February 8, 2009 Thanks Hermann, your answer helped a bit. According to the formula that is given on the wikipedia site, I get the carbon atom count right : 20. I get the oxygen atom count right also : 5. However I can't get the hydrogen count right. If each carbon has 4 bonds, so I would count that it has 4 hydrogen atoms attached. Right? And to those that have an oxygen, I would count 2 hydrogen attached to the carbon, is that correct? And what about the two bonds in the mollecule that are double bonds? How many hydrogen atoms would be there? That way, I count 42 hydrogen and there is supposed to be 32. What do I do wrong? Thanks a million for the help! Link to comment Share on other sites More sharing options...
ChemSiddiqui Posted February 8, 2009 Share Posted February 8, 2009 This type of structures are called skeletal structure. You might like to google how to deduce the MF from these type of structure. Good Luck! Link to comment Share on other sites More sharing options...
hermanntrude Posted February 8, 2009 Share Posted February 8, 2009 Thanks Hermann, your answer helped a bit. According to the formula that is given on the wikipedia site, I get the carbon atom count right : 20. I get the oxygen atom count right also : 5. However I can't get the hydrogen count right. If each carbon has 4 bonds, so I would count that it has 4 hydrogen atoms attached. Right? And to those that have an oxygen, I would count 2 hydrogen attached to the carbon, is that correct? And what about the two bonds in the mollecule that are double bonds? How many hydrogen atoms would be there? That way, I count 42 hydrogen and there is supposed to be 32. What do I do wrong? Thanks a million for the help! Carbon has four bonds in total. So for a carbon in a chain (which already has two other carbons attached) there are two hydrogens. For a carbon which has a single bond to one carbon and a double bond to another carbon, there is only one hydrogen. and so on. THIS PAGE, the wikipedia page that chemsiddiqui was referring to, has two more examples. Link to comment Share on other sites More sharing options...
mphilippe Posted February 8, 2009 Author Share Posted February 8, 2009 Ah yes ok your explanation was clearing it ! thanks a lot! Link to comment Share on other sites More sharing options...
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