Calculate the atomic mass of element "X" if it has two naturally occurring isotopes with the following masses and natural abundances:
X-45 44.8776 amu 32.88%
X-47 46.9443 amu 67.12%
A)46.26 amu
B)45.91 amu
C)46.34 amu
D)46.84 amu
E)44.99 amu

Question

Calculate the atomic mass of element "X" if it has two naturally occurring isotopes with the following masses and natural abundances: 
X-45 44.8776 amu 32.88%
X-47 46.9443 amu 67.12%
A)46.26 amu
B)45.91 amu
C)46.34 amu
D)46.84 amu
E)44.99 amu

Quizplus · Accepted Answer

The atomic mass is calculated by multiplying the mass of each isotope by its natural abundance (expressed as a decimal), then summing these values: (44.8776 * 0.3288) + (46.9443 * 0.6712) = 46.26 amu.

Calculate the Atomic Mass of Element "X" If It Has