top of page
mass
'no magic to the mole'
amount
molar mass
concentration
solution volume
gas volume
molar gas volume
Avogadro
constant, L
number of
entities, N
Now try the following question.
B3. ISOTOPES & RELATIVE ISOTOPIC MASSES - 4
3.4 CALCULATING A FOR POLYNUCLIDIC ELEMENTS
(i.e., those displaying isotopy)
r
The Relative Atomic Mass (Ar) of a polynuclidic element is obtained by calculating the
'weighted-average’ mass arising from the contributions of the various isotopes,
i.e., from a consideration of its isotopic composition, aka relative abundances.
In order better to appreciate the quite simple arithmetical procedure involved in such calculations, the first example considered concerns nothing more complicated than several planks of wood
of two different lengths. In a science lab this can easily be demonstrated using wooden splints.
text books, www sites and, unsurprisingly therefore, pupils/students/learners/instructors.
bottom of page