Use the data given in the following table to calculate the molar mass of naturally occurring argon isotopes:

Isotope Isotopic molar mass Abundance

³⁶Ar 35.96755 gmol^–1 0.337%

³⁸Ar 37.96272 gmol–1 0.063%

⁴⁰Ar 39.9624 gmol^–1 99.600%

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Solution

Step 1:
Average atomic mass = $\frac{S u m o f t h e p r o d u c t s o f m a s s e s a n d n a t u r a l a b u n d a c e s}{100}$
Step 2:
Molar mass of argon =

= 39.947gmol–1
Hence, the molar mass of argon is 39.947 g/mol

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101

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Calculate the atomic mass (average) of chlorine using the following data:

^{24} M g

^{25} M g

^{26} M g

\begin{matrix} Isotope & Atomic Mass & Isotopic abundance^{24} M g & 23.98504 & 78.70 %^{25} M g & 24.98584 & 10.13 %^{26} M g & 25.98259 & 11.17 % \end{matrix}

\begin{matrix} I s o t o p e & p e r N a t u r a l a b u n d a n c e & M o l a r m a s s^{1} H & 99.985 & 1^{2} H & 0.015 & 2 \end{matrix}

^{1} H

99.985

1

^{2} H

0.015

2

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