The isotope lithium-7 has a mass of 7.0160 atomic mass units, and the isotope lithium-6 has a mass of 6.0151 atomic mass units. Given the information that 92.58% of all lithium atoms found in nature are lithium-7 and 7.42% are lithium-6, calculate the atomic mass of lithium, Li (atomic number 3).
A. 7.0160 amu
B. 13.031 amu
C. 6.942 amu
D. 6.495 amu
Answer: C
Environmental & Atmospheric Sciences
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