Stochio is Greek for element, and metry means measurement. Therefore, stoichiometry is the branch of chemistry that deals with quantities of elements and compounds involved in a reaction.
Using the example 4NH3 + 5O2 --> 6H20 + 4NO, we can conclude that the mole ratio is 4:5:6:4.
4 moles of NH3 react with 5 moles of O2 to produce 6 moles of H20 and 4 moles of NO.
AN example question is : How many moles of O2 will be formed when 9000 moles of H20 is decomposed?
9000mole H20 X 1mole O2 / 2mole H20 = 4500 mol O2
**** we divide the 9000moles of H20 by 1/2 because in H20, there is 2 moles of H and 1 mole of O!
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