Stoichiometry
- The coefficients in balanced equations represent moles
- Also conversion factors
- what you need/what you have
Example #1
How many moles of Sodium metal are needed to react with 0.0250 mol of Magnesium Chloride
Balanced equation: MgCl2 + 2Na ----> 2NaCl + Mg
0.0250mol MgCl2 X 2Na/1 MgCl2 = 0.0500mol of Na
Example #2
How many grams of oxygen is needed when 0.480mol of water is produced?
Balanced equation: 2H2 + O2 ----> 2H2O
0.480mol H20 X 1O2/2H20 = 0.240mol of O2
Then use the mol to find g
o.240mol X 32g/ 1mol = 7.8 grams of O is needed
* Make sure you take time to balance the equation properly
This ties together everything we've learned so far...pretty easy huh?
http://www.youtube.com/watch?v=-W9-sNfM5Xo
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