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Two stable isotopes of lithium .3^6Li an...

Two stable isotopes of lithium `._3^6Li` and `._3^7Li` have respective abundances of 7.5% and 92.5% . These isotopes have masses 6.0152 u and 7.016004 u respectively. Find the atomic weight of lithium

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Average atomic mass `=(p_1m_1+p_2m_2)/(p_1+p_2)`
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