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What is special about the Avogadro's Constant ? 
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#1
Feb1612, 07:07 AM

P: 73

6.0221367x10^23 is the avogrado's constant. Does this amount of substances just mean that 6.0221367x10^23 molecules or atoms in gaseous state arrangement will occupy a constant volume provided they are under the same condition(same temperature and pressure) ??
Is it true that the avogadro's constant also imply that with this amount of atoms of same element, they could contribute a mass(g) of exactly a whole number ?? 


#2
Feb1612, 08:17 AM

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#3
Feb1612, 09:08 AM

P: 73

sorry why it will not be a whole number ? wasn't chemist found that 6.02^23 hydrogen atoms will make up 1 g ? so for the atoms of other element which is n times heavier than onetwelfth of the mass of a carbon12 isotope(or the mass of a hydrogen1 atom = 1.66 x 10^27 kg) supposed to have a mass of (n x no. of times heavier than 1/12 of a carbon12 isotope ) right ? ?



#4
Feb1612, 09:20 AM

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What is special about the Avogadro's Constant ?



#5
Feb1712, 09:11 AM

P: 76

The mol is really just a proportionality constant to convert amu to grams.



#6
Feb1712, 09:12 AM

P: 76

But It looks like Borek already answered that, sorry didn't see your posts, computer page redirected me to advanced reply.



#7
Feb1812, 12:33 AM

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#8
Feb1812, 03:20 AM

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#9
Feb1912, 08:03 AM

P: 73

a new question, is it true that the mass of an atom(atomic mass) is equal to the total mass of of all the protons, neutrons and electrons in that atom ?? and is that the mass of a atom is always constant ??



#10
Feb1912, 04:18 PM

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#11
Mar512, 08:49 AM

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#12
Mar812, 08:35 PM

Mentor
P: 12,070

http://www.wolframalpha.com/entities...n_16/5x/ju/gs/ http://en.wikipedia.org/wiki/Oxygen16#Table It is not simply a matter of adding the masses of the protons, neutrons, and electrons. There is an energy change when these particles are combined vs. when they are isolated. The energy change will contribute to the mass of the atom, via the famous relation E=mc^{2}. If not for this massenergy equivalence, there would be no energy given off in nuclear reactions. 


#13
Mar1112, 11:51 AM

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#14
Mar1112, 01:14 PM

P: 73

Can anyone please show me the working on calculation of relative isotopic mass of any isotope?? thanks a lot!!



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