Question

May I know the definition of molecular weight? & how do materials with same structure vary in their molecular weight & consequently vary in their physical properties?

Answer 1

Hello @idsunrise25 !

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Answer 2

Molecular weight, is the sum of the weight of all the atoms in a molecule. It is the weight of a single molecule of a substance.

Answer 3

For example, molecular weight of \(\large\tt H_2O\) = 2\(\times\)atomic weight of H + Atomic weight of O = 2+16=18 u

Answer 4

Getting it ?

Answer 5

thank you very much for the definition 7 the example, but according to that definition how does this referenced phrase come true; Although the highly purified sodium hayluronate from each of these sources has the same structure, the molecular weight can vary and is a critical factor in the physical properties as well as a source of patent disputes (Van Brunt, 1986).

Answer 6

& not "7", typing error sorry for that

Answer 7

Molecular weight can vary if the source have different isotopes of the same element.

Answer 8

and isotopes have similar chemical but different physical properties.

Answer 9

yes I got it & thank you very much for your help; but may you help me understand how does several patents of sodium hyalurinate vary in their molecular weights?

Answer 10

\(\color{blue}{\text{Originally Posted by}}\) @Abhisar
Molecular weight can vary if the source have different isotopes of the same element.
\(\color{blue}{\text{End of Quote}}\)

Answer 11

\(\color{blue}{\text{Originally Posted by}}\) @Abhisar
and isotopes have similar chemical but different physical properties.
\(\color{blue}{\text{End of Quote}}\)

Answer 12

mmm, you mean concentration?

Answer 13

`Isotopes` are same elements having different number of neutrons.

Answer 14

Atomic mass of an element is is actually the `sum of number of protons and neutrons in the nucleus of its atom.`

Answer 15

yes

Answer 16

In your case sodium element has almost `twenty recognized isotopes ` ranging from atomic mass `18 to 37`

Answer 17

*
So the actual molecular mass of sodium Hyalurinate depends upon which sodium is inside it.

Answer 18

Which in turn depends upon source.

Answer 19

so, it isn't a matter of different numbers of molecules of each patent; it is the matter of different isotopes of the same molecule... Thank you very much you enlightened me I'm grateful :)

Answer 20

If the structure is same then i don't think the number of molecules will defer.

Answer 21

*differ

Answer 22

yes I got it, it is the same structure ... thank you very much for your help

Answer 23

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Answer 24

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Answer 25

Sure :) .. Thanks a million for your suggestions & rapid help

Answer 26

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