Question

An element has two isotopes with their atomic masses 19u and 21u . Their relative abundance are 90% and 10% respectively average atomic mass of the element is​

Answer 1

Answer:

19.2 u

Explanation:

Amu stands for unified atomic mass. This unit is mostly used to define the mass of atoms and molecules.

Now in order to determine the average atomic mass of an element with two isotopes, we would use the following formula

Average atomic mass = (Atmoic Mass of 1st isotope x its abundace) +  (Atmoic Mass of 2nd isotope x its abundace)

Average atomic mass = (19 x 0.9) +  (21 x 0.1)

Average atomic mass = (17.1) +  (2.1)

Average atomic mass = 19.2 u

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