Mole ConceptHard
Question
Two isotopes of an element Q are Q97 (23.4% abundance) and Q94 (76.6% abundance). Q97 is 8.082 times heavier than C12 and Q94 is 7.833 times heavier than C12. What is the average atomic weight of the element Q?
Options
A.94.702
B.78.913
C.96.298
D.94.695
Solution
Average atomic mass of Q =$\frac{23.4 \times 8.082 \times 12 + 76.6 \times 7.833 \times 12}{100}$= 94.695
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