Stoichiometry is a branch of chemistry that deals with the application of the laws of definite proportions and of the conservation of mass and energy to chemical activity. Stoichiometry also obeys the definition: the quantitative relationship between two or more substances especially in processes involving physical or chemical change.

Stoichiometry's history is one that is difficult to find and very scarce of information once found. The principles of stoichiometry were first layed down by a man by the name of Jeremias Benjaim Richter. Jeremias Benjaim Richter was born in 1762, and he died in the year of 1807. he only lived to the age of fourty-five. Speaking origenally german, he said in the year of 1792, and I quote, "Die stöchyometrie ist die Wissenschaft die quantitativen oder Massenverhältnisse zu messen, in welchen die chymischen Elemente gegen einander stehen." I

10.0 grams of methane has a molecular weight of 16.04 g/mole

Mass of MgO = 0.206 moles times 40.3 grams per mole

If the reaction had gone perfectly, we should have formed 22.5 grams of water. You only formed 19.8 however, so your percent yield is:

10 grams divided by 16.04 grams per mole = 0.623 moles of methane.

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