Respuesta :
The average mass of all of
the isotopes of a substance Isotopes are atoms from
the same element
(therefore containing the
same number of protons)
which have different
numbers of neutrons.
1. Multiply the mass of each
isotope by the % of the
isotope
2. Add the products
Sulfur has three main isotopes.
95% is Sulfur-32, 4% is Sulfur-34,
and 1% is Sulfur
- 33.
So 32.09 amu