Question

For the following molecule with a coefficient: 3Fe2(C204)3
Indicate how many atoms of FE?
Indicate how many atoms of C?
Indicate how many atoms of O?

Answer 1

Fe $\to$ no. of molecules(3) × no. of atoms in a molecule(2) = 6 atoms.

C $\to$ no. of molecules(3) × no. of atoms in a molecule(2 × 3) = 18 atoms.

O $\to$ no. of molecules(3) × no. of atoms in a molecule(4 × 3) = 36 atoms.