What are some common mistakes students make with chemistry?
If you can add and subtract, i.e. if you can do basic arithmetic, you can do chemistry... Even as an undergraduate there is little mathematics beyond basic arithmetic, addition, subtraction, multiplication, and division....
All chemical reactions follow the principle of conservation of mass..if you start with 10 g of reactant, at most you can get 10 g of product. All of stoichiometry is based on this