Formulas for Chem Flashcards
1
Q
Relative atomic mass
A
Total mass/total number of atoms
2
Q
The abundance of chlorine-35 is 75% and the abundance of chlorine-37 is 25%. Calculate the relative atomic mass, Ar, of chlorine.
A
[(75x35)+(37x25)]/75+25 so Ar = 35.5
3
Q
Relative isotopic mass
A
the mass of a particular atom of an isotope compared to the value of the unified atomic mass unit
4
Q
Mass spectra
A
mass/electron (charge of ion) ratio from spectroscopy
