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mixas84 [53]
4 years ago
7

The table below gives the data that is needed to calculate the average atomic mass of element B. Isotope Atomic mass (amu) Relat

ive abundance (%) B-10 10.01 19.91 B-11 11.01 80.09 Based on these data, what is the average atomic mass of element B?
Chemistry
1 answer:
labwork [276]4 years ago
5 0

Answer:

This element is Boron (B) and has an average atomic mass of 10.8109 u

Explanation:

The average mass of an element is calculated by taking the average of the atomic masses of its stable isotopes.

The enitre atomic mass = 100 % or 1

⇒ this consists of 19.91 % atoms with mass 10.01 u

19.91 % = 0.1991

⇒ this consists of 80.09 % atoms with mass 11.01 u

80.09 % = 0.8009

To calculate the mass of this isotope we use the following:

0.1991 * 10.01 + 0.8009 * 11.01 = 10.8109 u

This element is Boron (B) and has an average atomic mass of 10.8109 u

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