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Two Stable Isotopes of Lithium 6by3Li 3 n by 6 Li and 73li37li `Have Respective Abundances of 7.5% and 92.5%. These Isotopes Have Masses 6.01512 U and 7.01600 U, Respectively. Find the Atomic Mass of Lithium. - Physics

Two stable isotopes of lithium `""_3^6Li` and `""_3^7Li` `have respective abundances of 7.5% and 92.5%. These isotopes have masses 6.01512 u and 7.01600 u, respectively. Find the atomic mass of lithium.

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Solution

Mass of lithium isotope `""_3^6 Li`,  m1 = 6.01512 u

Mass of lithium isotope `""_3^7 Li`, m2 = 7.01600 u

Abundance of `""_3^6 Li`, η1= 7.5%

Abundance of `""_3^7 Li`, η2= 92.5%

The atomic mass of lithium atom is given as:

`m = (m_1eta_1 + m_2eta_2)/(eta_1 + eta_2)`

`= (6.01512 xx 7.5 + 7.01600 xx 92.5)/(92.5 + 7.5)`

= 6.940934 u

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APPEARS IN

NCERT Class 12 Physics Textbook
Chapter 13 Nuclei
Q 1.1 | Page 462
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