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Chapter 11: Stoichiometry 1.) Write out the balanced equation of the problem. 2.) Write out the number, unit, and substance in the top corner of the first bracket. 2ex.) # Unit A 3.) The unit and substance will be written in the bottom of the next bracket. 3ex.) # Unit A Unit A - If you start with grams, find formula mass of A and put 1 Mol A on top. 1 Mol A #gA Unit A gA Unit A - If you start with moles, Mol A goes on the bottom, Mol B on top, then use coefficient(s) for numbers. Mol B (Possible Coefficient #) Mol B Mol A 4.) If starting with grams, the 3rd bracket Mol B over Mol A with coefficient(s) as number(s). 5.) If looking for grams (Mass) of B, then formula mass of B goes over 1 Mol B. A = What you start with. B = What you are looking for. #gA 1 Mol A Grams to Mole (If you want Mole to Gram, both are M-M, with what you look for in the top. Mol B gB Mol A gA Mole to Mole Grams to Mole/Mole to Gram 1 Mol B Mass to Mass (Gram to Gram) Tips on Balancing Equations Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, and Iodide are diatomic molecules. Hydrocarbon reactions with diatomic molecules result in 2, 7, 6, 4 order.