Question: Two stable isotopes ${}_{3}^{6}Li$ and ${}_{3}^{7}Li$ have respective abundances of$7.5\%$ and...

Question

Two stable isotopes ${}_{3}^{6}Li$ and ${}_{3}^{7}Li$ have respective abundances of $7.5\%$ and $9.2\%$ these isotopes have masses $6.01512$ u and $7.01600$ u respectively the atomic weight of lithium is.

Answer 1

Solution

: Atomic weight = average weight of the isotopes

$= \frac{6.01512 \times 7.5 + 7.01600 \times 92.5}{(7.5 + 92.5)} = \frac{45.1134 + 648.98}{100} = 6.941$ u

Question: Two stable isotopes \({}_{3}^{6}Li\) and \({}_{3}^{7}Li\) have respective abundances of\(7.5\%\) and...

Solution