Question

Chlorine occurs in nature in two isotopic forms,with atomic masses 35u and 37u in the ratio 3:1.Calculate the average atomic mass of chlorine atom

Answer 1

Answer:

35.5

Explanation:

just do (3*35+1*37)/4

Answer 2

The average atomic mass of chlorine atom is 35.5 amu

Explanation:

Average atomic mass is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

Formula used to calculate average atomic mass follows:

$\text{Average atomic mass }=\sum_{i=1}^n\text{(Atomic mass of an isotopes)}_i\times \text{(Fractional abundance})_i$

We are given:

Two isotopes of chlorine which are Cl-35 ansd Cl-37

Average atomic mass of silicon = ?

$\text{Average atomic mass }=(35\times \frac{3}{4})+(37\times \frac{1}{4})$

$\text{Average atomic mass }=35.5amu$

The average atomic mass of chlorine atom is 35.5 amu

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