Question

element z has the following isotopes:

• z - 62: atomic mass = 61.93 amu, abundance = 69.17%

• z - 64: atomic mass = 63.93 amu, abundance = 30.83%

the average atomic mass of element z is: amu

Explanation:

Step1: Convert abundances to decimals

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

Step2: Calculate contribution of Z - 62

$61.93\times0.6917 = 42.841181$

Step3: Calculate contribution of Z - 64

$63.93\times0.3083 = 19.609619$

Step4: Find average atomic mass

$42.841181+19.609619 = 62.4508\approx62.45$

Answer:

$62.45$