Use the information for the isotopes of element x to calculate the average atomic mass of x, and identify the element. isotope abundance mass (amu) 35x 75.77% 34.969 37x 24.23% 36.965

Answer

36.45 u; X = Cl

Explanation:

The atomic mass of X is the weighted average of the atomic masses of its isotopes.

We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its percent of the total).

Set up a table for easy calculation .

0.7577  × 34.969 u = 26.496   u

0.2423 × 36.965 u =   8.9566 u

                   TOTAL = 36.45     u

X = Cl

average atomic mass of the element is 35.4536 amu and the element is chlorine.

Explanation:

Mass of isotope 1 = 34.969

% abundance of isotope 1 = 75.77% =

Mass of isotope 2 = 36.965

% abundance of isotope 2 = (24.23)% =

Formula used for average atomic mass of an element :

Therefore, the average atomic mass of the element is 35.4536 amu and the unknown element will be Chlorine.

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