Answer:
35.453g/mol is the average atomic mass of the element
Explanation:
The average atomic mass of an element is defined as the sum of the mass of its isotopes multiplied by its natural abundance.
The element of the problem has 2 isotopes:
The first with a mass of 34.969g/mol and its abundance is 75.77%
The second has a mass of 36.966g/mol and its abundance is 24.23%
Its natural abundance is:
34.969g/mol * 75.77% + 36.966g/mol * 24.23%
35.453g/mol is the average atomic mass of the element
