Question

For the following elements, calculate the average atomic mass. Carbon-12

98.93%, Carbon-13 1.07% *

Answer 1

Average atomic mass of carbon = 12.01 amu

Step-by-step explanation:

Given data:

Average atomic mass = ?

Percent abundance of C-12 = 98.93%

Percent abundance of C-13 = 1.07%

Solution:

Average atomic mass of carbon = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) / 100

Average atomic mass of carbon = (98.93×12)+(1.07×13) /100

Average atomic mass of carbon= 1187.16 + 13.91 / 100

Average atomic mass of carbon = 1201.07/ 100

Average atomic mass of carbon = 12.01 amu