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JAMB Chemistry 2011 Objective — Question 6

Question 6 of 49 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

The relative atomic mass of a naturally occurring lithium consisting of 90% Li and 10% Li is

A. A. 6.8
B. B. 6.9Correct
C. C. 7.1
D. D. 6.2

Explanation

R.A.M. = (Mass1x%1 + Mass2x%2)/100 = ((7x90)+(6x10))/100 = 6.9.

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