
#1
Apr1205, 03:12 PM

P: 53

When it says; "Molecular Weight: daltons (g/M)" What does daltons mean and what does (g/M) stand for? Does g/M stand for g/mol or what?
How can they calculate Molecular Weight for nucleotides? Thanks for any inputs. 



#2
Apr1205, 03:19 PM

Emeritus
Sci Advisor
PF Gold
P: 4,622

A dalton is an atomic mass. For instance C12 has a mass of 12.0000 Da. The mw is the mass of 1 mole of a particular molecule. By definition 1 mole of carbon atoms weighs 12 grams.




#3
Apr1205, 03:53 PM

P: 53

Thanks.
But what does M stand for in g/M? 



#4
Apr1205, 04:07 PM

Emeritus
Sci Advisor
PF Gold
P: 12,257

Molecular Weight for nucleotides 



#5
Apr1305, 01:34 AM

P: 540

(1) C12 has a mass of 12 Da (by definition; exactly 12, there is no uncertainty) (2) a mol of C12 atoms weighs 12 grams (by definition) From (1) and (2) it follows that a dalton is the number of grams that go into a mol (gram/mol) __________________________________________________ (1) C12 = 12 Da <> mol C12 = mol 12 Da (2) mol C12 = 12 gram (substitute 2 into 1) 12 gram = mol 12 Da <> gram/mol = Da 



#6
Apr1305, 09:00 AM

P: 76

doesn't g/M mean g/mol/L?




#7
Apr1305, 10:11 AM

PF Gold
P: 1,236

its not exactly 12, and its not exactly 16 for oxygen either
but they decided to make it 12 anywho. so just use 12 as a whole number 6 protons = 6 x 1.007277 6.043662 6 neutrons = 6 x 1.008665 6.051990 6 electrons = 6 x 0.000548 0.003288 Total 12.098940 


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