HI
I'd like to ask if anyone would give me a website that provides quizes or questions on how to balance a formula with the symbols.
Example
iron ( iii) oxide
It will become Fe3O2 but when we change it
Fe203 is the right answer
this sort of questions
http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson53.htm
see the links at the end of that tutorial.