The Average Molar Mass of Lithium Is 6

question 54

Multiple Choice

The average molar mass of lithium is 6.941.A sample of lithium consists of two isotopes with masses of 6.01512 amu and 7.01600 amu.Determine the percent abundance of each isotope.

• A) 7.49% Li-6 and 92.51% Li-7
• B) 8.45% Li-6 and 91.55% Li-7
• C) 12.49% Li-6 and 87.51% Li-7
• D) 91.55% Li-6 and 8.45% Li-7
• E) 92.51% Li-6 and 7.49% Li-7