Question

plz answer it =_= ......​

Answer 1

Answer:

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Answer 2

Answer:

Atomic Mass =

[(mass of isotope) (%abundance) ] + [(mass of isotope) (%abundance)] + [….]

100%

The equation continues on[….] based on the number of isotopes in the problem.

Atomic mass of lithium -

Aw = [(%abundance of isotope) (mass of isotope)] + [(%abundance of isotope) (mass of isotope)] + [….]

6.94 =[(% 6Li)(6.015121)] + [(%7Li)(7.016003)]

100% of Lithium is determined by these two naturally occurring isotopes.

By using the above formula, we get,

Aw = { (7×6) + (93×7)

Atomic mass = 6.941 u

Hence, atomic mass of Lithium =

= 6.941 u