Fe + 3/2 Cl2 => FeCl3
3/2 * 35.5 g Cl2............162.5 g FeCl3
120 g Cl2.............................x
x = 366.197 g FeCl3
2 K + 1/2 O2 => K2O
2*39 g K...........1/2 moli O2
1.526 g K................x
x = 0.01 moli O2 = 10 mmoli O2
H2 + Cl2 => 2 HCl
1 mol Cl2........2*36.5 g HCl
x..........................2190 g
x = 30 moli Cl2