Hi guys,Just a bit of background on me: I completed chemistry in high school and did pretty good, but then when I went to university I didn't take any chem courses for a year. This coming fall I'm going to be enrolled in an introductory university chem course, so I'm doing some prep work now.The question:Calculate the total number of atoms in one molecule of trinitrotuluene (TNT), CH3C6H2(NO2)3.My answer:So in ONE molecule, wouldn't the number of atoms just be the combined number of all its constituents? So is 21 the correct answer?Thanks,Mike

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ArkconRetired StaffSr. Member
Posts: 7367Mole Snacks: +533/-147

Yep. Good work. You've gotten the terms down straight. Now, try the rest of the associated problems.
mburtRegular MemberPosts: 23Mole Snacks: +0/-0
Thanks for your quick response! I'm pretty sure I understand the basic concepts of molecules made up of atoms (and compounds made up of loads of molecules), and ionic compounds which are expressed in ratios of ions, with the convention of formula units (even though the actual pairs of ions may not exist).It's all starting to come back to me now.
No, check the definitions again. A molecule is a neutral compound that is held together only by covalent bonds. Compound is just a more general term - a molecule is a sub-type of compound.
I was talking about the actual composition of organic compounds- that they are made up of molecules. Are they not?
No.http://en.wikipedia.org/wiki/Chemical_compoundandhttp://en.wikipedia.org/wiki/MoleculeI drew you a Venn diagram, hopefully that will help clarify it:

See more: A Switch Is Typically Preconfigured With One _______________ That Includes All Its Ports.

Alright I read through the Wikipedia page and the diagram you provided, but I can't help get the feeling that this goes against everything I've learned about compounds in chemistry.My basic understanding is this (water will be my example):Hydrogen atoms, H, are found in proportions of 2:1 with oxygen atoms, O, to make a water molecule. I thought that if you had a volume of water, say 1 L, that the 1 L is made up of millions of molecules of H20.So isn't the compound water, made up of water molecules? In my head I just see lots H20 interconnected molecules.I understand that ionic compounds are different altogether - I do have some grasp of it, but maybe that question is for another time - but the question I am asking, I think, is mostly involved with molecules with covalent, and not ionic bonds.Thanks for your help