Topic Content:
- Meaning of Relative Atomic Mass
The relative Atomic mass of an element is the number of times the average mass of one atom of that element is heavier than one-twelfth the mass of one atom of carbon-12.
\(\scriptsize Relative \: Atomic\: Mass = \normalsize \frac{mass \: of \: 1 \: atom \: of \: the\: element }{\frac{1}{12} \: \times \: mass \: of \:1\: atom \: of \: Carbon-12 } \)
From the definition,
1 carbon atom has a mass of 12
1 oxygen atom has a mass of 16
1 hydrogen atom has a mass of 1
The relative atomic mass of an element which exhibits Isotopy is the average mass of its various isotopes.
Relative atomic mass is not a whole number because of the existence of an isotope.
Example 6.4.1:
A natural occurring Chlorine contains 75% of \( \scriptsize _{17} ^{35} \textrm {Cl} \) and 25% of \( \scriptsize _{17} ^{37} \textrm {Cl} \)
Calculate the relative atomic mass of Chlorine.
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