Using the given data, calculate the average atomic mass of argon.… - Vidyadip

MCQ

Using the given data, calculate the average atomic mass of argon.

Isotope	Atomic mass (amu)	Relative abundance (%)
36 _Ar	35.97	0.337
38 _Ar	37.96	0.063
40_Ar	39.96	99.6

A
39.94 amu
B
38.00 amu
C
38.50 amu
D
40 amu

✓

Answer

A. 39.94 amu
Explanation:
$\begin{array}{l}\text { Average atomic mass }=\frac{\text { Sum of (Isotopic mass } \times \text { its } \% \text { abundance ) }}{100} \\ =\frac{(35.97 \times 0.337)+(37.96 \times 0.063)+(39.96 \times 99.6)}{100} \\ =39.94 amu \end{array}$

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