Iodine has an average atomic mass of 126.905 g/mol. What is the isotopic mass of the most common isotope of Iodine? Enter a whole number below.

Copper has an average atomic mass of 63.546 g/mol and only exists as Copper-63 and Copper-65. What is the isotopic mass of the most common isotope of Copper? Enter a whole number below.

Most of the Carbon on earth exists as Carbon-12. However, small amounts of Carbon-13 and Carbon-14 also exist. What whole number will Carbon's average atomic mass closest to?

Calculate the average atomic mass of Chlorine if you know that 75.77% exists as Chlorine-35 (34.969 g/mol) and 24.23% exists as Chlorine-37 (36.966 g/mol). Use two decimal places in your answer and do not include a unit.

In a sample of 400 Lithium atoms, it is found that 30 atoms are Lithium-6 (6.015 g/mol) and 370 atoms are Lithium-7 (7.016 g/mol). Calculate the average atomic mass of Lithium and enter the number below. Use two decimal places.