JAMB - Chemistry (2016 - No. 10)
The relative atomic mass of a naturally occurring lithium consisting of 90%\(\frac{7}{3}\)Li and 10%\(\frac{6}{3}\)Li is
6.2
6.8
7.1
6.9
Vysvětlení
(\(\frac{90}{100}\) x 7) + (\(\frac{10}{100}\) x 6)
= 6.3 + 0.6 = 6.9
= 6.3 + 0.6 = 6.9