%Al = \(\dfrac{M\left(Al\right)}{M\left(Al\left(NO3\right)3\right)}=\dfrac{27}{213}\approx12,68\%\)
Tương tự, %N = 19,72% và %O = 67,6%
Ta có MAl(NO3)3 = 27 + 14 .3 + 16 . 3 . 3 = 213
=> %MAl = \(\dfrac{27}{213}\) . 100 \(\approx\) 12,68 %
=> %MN = \(\dfrac{14\times3}{213}\) . 100 \(\approx\) 19,72 %
=> %MO = 100 - 12,68 - 19,72 = 67,6 %