Lithium-6 is 7% abundant and Lithium-7 is 93% abundant. What is the average atomic mass with the correct significant figures? O 7 amu
O 6.9 amu
O 6.93 amu
O 6 amu

Average atomic mass  = 6.93 amu.

Explanation:

Given data:

Percent abundance of lithium -6 = 7%

Percent abundance of lithium - 7 = 93%

Average atomic mass of Li = ?

Solution:

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)  / 100

Average atomic mass  = (7×6)+(93×7) /100

Average atomic mass =  42+ 651 / 100

Average atomic mass  = 693/ 100

Average atomic mass  = 6.93 amu.

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.