the weighted average of its naturally occurring isotopes. chemical name atomic # chemical symbol...
Post on 13-Dec-2015
213 Views
Preview:
TRANSCRIPT
Average Atomic Mass
The weighted average of its naturally occurring isotopes.
Average Atomic Mass
Chemical NameAtomic #
Chemical Symbol
Atomic Mass(Average Atomic Mass)
Multiply the mass of each isotope by its abundance to get the weighted average.
Average Atomic Mass
100
.....)(%)(% massmass
Boron is 80.20% boron-11 (atomic mass 11.01 amu) and 19.80% boron-10 (atomic mass 10.01 amu). What is the average atomic mass of boron?
Example
100
01.1080.1901.1120.80
01.101980.001.118020.0
amu81.10
Neon has 2 isotopes. Neon-20 has a mass of 19.992 amu. Neon-22 has a mass of 21.991 amu. In an average sample of neon atoms, 90%
will be neon-20 and 10% will be neon-22. Calculate the average atomic mass.
Example
100
991.2110992.1990amu192.20
top related