Three isotopes of argon occur in nature – 36/18Ar, 38/18Ar, and 40/18Ar. Calculate the average atomic mass of argon to two decimal places, given the following relative atomic masses and abundances of each of the isotopes;
a. argon-36 (35.97 amu; 0.337%)
b. argon-38 (37.96 amu; 0.063)
c. and argon-40 (39.96 amu; 99.600%).