Write the formula correctly

The program is designed to improve the study and memorization of chemical formulas.

You can create your own formulas. You can also add them to your favorite or choose a difficult level.

You can view a list of all formulas with their attributes.
 
The program has a mode of improving learning and memorizing chemical formulas. Here are the formulas
who are in a mess. You need to write a formula from these parts and enter it in the appropriate field.