Question

A sample of Element X is found to contain 67.25% of isotope type 1 (85.91) and 32.75% of isotope type 2 (87.91). Calculate the average atomic mass.

Answer 1

Answer:

86.56 g/mol is the average atomic mass of the element X

Explanation:

The average atomic mass of an element is defined as the sum of the masses of each isotope times its percentage. For the element X the average atomic mass is:

85.91×67.25% + 87.91×32.75%

85.91×0.6725 + 87.91×32.75

86.56 g/mol is the average atomic mass of the element X