ENG 2002 Lecture Notes - Electronvolt, Phosphide, Electronegativity
2 Apr 2014
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2. 1 cite the difference between atomic mass and atomic weight. Atomic mass is the mass of an individual atom, whereas atomic weight is the average (weighted) of the atomic masses of an atom"s naturally occurring isotopes. On the basis of these data, confirm that the average atomic weight of cr is 51. 9963 amu. The average atomic weight of silicon (a cr) is computed by adding fraction-of-occurrence/atomic weight. (0. 0434)(49. 9460 amu) + (0. 8379)(51. 9405 amu) + (0. 0950)(52. 9407 amu) + (0. 0237)(53. 9389 amu) = 51. 9963 amu. 2. 3 (a) how many grams are there in one amu of a material? (b) mole, in the context of this book, is taken in units of gram-mole. Solution (a) in order to determine the number of grams in one amu of material, appropriate manipulation of the amu/atom, g/mol, and atom/mol relationships is all that is necessary, as. # g/amu = (b) since there are 453. 6 g/lbm, 1 lb - mol = (453. 6 g/lbm) (6. 022 10 23 atoms/g - mol)
