Lithium Forms Compounds Which Are Used in Dry Cells, Storage

question 13

Multiple Choice

Lithium forms compounds which are used in dry cells, storage batteries, and in high-temperature lubricants. It has two naturally occurring isotopes, ⁶Li (isotopic mass = 6.015123 amu) and ⁷Li (isotopic mass = 7.016005 amu) . Lithium has an atomic mass of 6.9412 amu. What is the percent abundance of lithium-6?

• A) 92.53%
• B) 86.65%
• C) 49.47%
• D) 7.47%
• E) 6.015%