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 u 32.88%
X-47 46.9443 u 67.12%
A) 46.26 u
B) 45.91 u
C) 46.34 u
D) 46.84 u
E) 44.99 u

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 u 32.88%
X-47 46.9443 u 67.12%
A) 46.26 u
B) 45.91 u
C) 46.34 u
D) 46.84 u
E) 44.99 u

Quizplus · Accepted Answer

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

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