Tuesday, February 2, 2010 7:18 PM
Not a lot of notes but there are a few examples on this subject
1. Coefficients in balanced equations represent moles
- They are also conversion factors
Examples (Told you there weren't a lot of notes)
1.If a 0.15 mole sample of methane reacts with oxygen, how many moles of each product are produced?
CH4 + 2 O2 --> CO2 + 2 H2O
(0.15 mole)
-0.15 mol CH4 x 1mol CO2 = 0.15 mol CO2
----------------1mol CH4
-0.15 mole CH4x 2mol H2O = 0.30mol H2O
----------------1mol CH4
Mass to Mass problems
1. Lead(IV) nitrate reacts with 5.0kg of Potassium Iodide. How many grams of Lead(IV) nitrate are required?
Pb(NO3)4 + 4KI --> PbI4 + 4KNO3
----------(5.0g)
5.0g x 1 mol x 1 Pb(NO3)4 x 455.2g = 34g
-------165.9g----4 KI------- 1 mol
Percent Yield
1. The theoretical yield of a reaction is the expected (calculated) amount
2. The experimental amount if the actual yield
- % yield = Actual x 100
------------Theoretical