Answer:
Average atomic mass of Argon
\[\text{=
}\!\!\Sigma\!\!\text{ }\frac{\text{ }\!\!%\!\!\text{
abundance}}{\text{100}}\text{ }\!\!\times\!\!\text{
Isotopic}\,\text{molar}\,\text{mass}\]
\[=\left[ \frac{0.337}{100}\times
35.96755 \right]+\left[ \frac{0.063}{100}\times 37.96272 \right]+\]
\[\left[
\frac{99.6}{100}\times 39.9624 \right]\]
\[=0.1212+0.0239+39.80255\]
\[=39.94765\text{ }g\,\,mo{{l}^{-1}}\]
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