Lithium occurs in two isotopes, namely, \( { }^{7} \mathrm{Li} \) P...

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Lithium occurs in two isotopes, namely, \( { }^{7} \mathrm{Li} \)
P (atomic mass: \( 7.00 \mathrm{amu} \) ) and \( { }^{6} \mathrm{Li} \) (atomic mass:

W \( 6.00 \mathrm{amu}) \). If there exists \( 7.4 \% \) of \( { }^{6} \mathrm{Li} \) in naturally occurring lithium, then its atomic mass will be
(A) \( 6.2 \mathrm{amu} \)
(B) \( 6.5 \mathrm{amu} \)
(C) \( 6.94 \mathrm{amu} \)
(D) \( 7.2 \mathrm{amu} \)
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