Answer:
17 atoms
Explanation:
If what we want is to calculate the number of atoms. We must take into account the subscripts of the formula. We can rewrite the formula taking into account the "ones" implicit in the formula, therefore we will have:
[tex]Al_2(Cr_1O_4)_3 [/tex]
Now we have a "3" outside the parenthesis. Therefore, we must multiply this 3 by the number of atoms within the parentheses:
-) Oxygen atoms: 4 x 3 = 12 atoms
-) Chromium atoms: 1 x 3 = 3 atoms.
If we take into account we have 2 aluminum atoms, in total, we will have:
-) 12 oxygen atoms
-) 3 chromium atoms
-) 2 aluminum atoms
12 + 3 + 2 = 17 atoms
In total, we will have 17 atoms.
See figure 1
I hope it helps!
