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.
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.
(why only four zeros?) (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
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
Carbon was easy to purify, that is why they used it as a reference and why it is the whole number 12.