METRY - MEASUREMENT
Stoichiometry deals with "quantitative analysis of chemical reactions and the measurement of elements and compounds involved in a reaction." It is the "study of relationship between the amount of reactants with the amount of products."
We can see that for every 2 moles of Hydrogen gas, 1 mole of Oxygen gas is needed to react. Similarily, for every 2 water molecules produced, 1 mole of Oxygen gas is needed.
These are called MOLE RATIOS, and they become very important in equations.
REMEMBER TO ALWAYS START WITH A BALANCED EQUATION.
Then, put the mole ratio of WHERE YOU ARE GOING over the mole ratio of WHERE YOU ARE COMING FROM.
E.g. If I knew that I had 4 moles of oxygen gas and wanted to find out how many moles of hydrogen I needed, I would multiply 4 by 2 moles of Hydrogen gas/1 mole of oxygen gas.
Here are some other important points to remember.
1) 1 mole = 6.022 x 10^23 molecules/atoms/particles/formula units
2) 1 mole = atom's/molecule's molar mass in grams
3) 1 mole = 22.4L at STP
4) Molarity (M) = moles of solute/volume of solution
YAY STOICHIOMETRY!
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