Calculate the atomic mass of chromium if chromium has four naturally occurring isotopes with the following masses and natural abundances:
Cr-50 49.9461 amu 4.35%
Cr-52 51.9405 amu 83.79%
Cr-53 52.9407 amu 9.50%
Cr-54 53.9389 amu 2.36%
A)51.941 amu
B)51.699 amu
C)208.766 amu
D)53.214 amu
E)51.996 amu

Question

Calculate the atomic mass of chromium if chromium has four naturally occurring isotopes with the following masses and natural abundances: 
Cr-50 49.9461 amu 4.35%
Cr-52 51.9405 amu 83.79%
Cr-53 52.9407 amu 9.50%
Cr-54 53.9389 amu 2.36%
A)51.941 amu
B)51.699 amu
C)208.766 amu
D)53.214 amu
E)51.996 amu

Quizplus · Accepted Answer

The atomic mass is calculated by multiplying each isotope's mass by its abundance (as a decimal), then summing these values: (49.9461 * 0.0435) + (51.9405 * 0.8379) + (52.9407 * 0.0950) + (53.9389 * 0.0236) = 51.996 amu.

Calculate the Atomic Mass of Chromium If Chromium Has Four