AP Chemistry Multiple Choice Practice Test

Question 1 of 3

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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.

	92.51% Li-6 and 7.49% Li-7
	12.49% Li-6 and 87.51% Li-7
	74.9% Li-6 and 92.51% Li-7
	8.45% Li-6 and 91.55% Li-7
	91.55% Li-6 and 8.45% Li-7