Question

practice calculating average atomic mass
using the information in the table, calculate the average atomic mass of copper. report to two decimal places.
copper
isotope mass (amu) abundance
cu - 63 62.929599 69.17%
cu - 65 64.927792 30.83%

Explanation:

Step1: Convert abundancias a decimales

$69.17\% = 0.6917$, $30.83\%=0.3083$

Step2: Calcular el producto de masa y abundancia para Cu - 63

$62.929599\times0.6917 = 43.5283046383$

Step3: Calcular el producto de masa y abundancia para Cu - 65

$64.927792\times0.3083 = 19.9172382736$

Step4: Sumar los productos

$43.5283046383 + 19.9172382736=63.4455429119$

Answer:

$63.45$ amu