Determine the average atomic mass of helium, which has two isotopes having atomic masses 4.0026 amu and 3.0160 amu.
The relative abundance of the two isotopes is 99.9999 percent and 0.0001 percent, respectively.

a)1.0066 amu
b)3.0160 amu
c)3.5903 amu
d)4.0026 amu

Question

Determine the average atomic mass of helium, which has two isotopes having atomic masses 4.0026 amu and 3.0160 amu.
The relative abundance of the two isotopes is 99.9999 percent and 0.0001 percent, respectively.

a)1.0066 amu
b)3.0160 amu
c)3.5903 amu
d)4.0026 amu

unklerhaukus · Answer

4.0026 [amu] x 99.9999/100 + 3.0160 [amu] x 0.0001/100