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Title: Stoichiometry
Description: Chem 1411 at lone star college north harris professor kenneth abayan. Also used the Zumdahl 10th editions chemistry book. This documents has notes and examples for stoichiometry including topics such as Avogadro's number, stoichiometry map, the mole, percent composition, empirical and molecular formula, chemical equations, balancing chemical equations, balancing hyrdocarbons, and percent yield. There are 7 pages of notes and an example for each for Chemistry 1. I use colors. I use a combination of lectures and zumdahl textbook to get my notes.
Description: Chem 1411 at lone star college north harris professor kenneth abayan. Also used the Zumdahl 10th editions chemistry book. This documents has notes and examples for stoichiometry including topics such as Avogadro's number, stoichiometry map, the mole, percent composition, empirical and molecular formula, chemical equations, balancing chemical equations, balancing hyrdocarbons, and percent yield. There are 7 pages of notes and an example for each for Chemistry 1. I use colors. I use a combination of lectures and zumdahl textbook to get my notes.
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3
...
022𝑥1023 of that substance
So 1 mole has 6
...
022𝑥1023 molecules
3
...
Such as molecules
3
...
5𝑥1015 atoms?
“A” refers to avogadro’s number
...
We write out the atoms given to us in the question
...
Therefore 1 mol goes on top
...
35 moles of molecules?
3
...
01 g
these numbers are found on the periodic table
1 mol Na = 22
...
0
b/c (1
...
0g of Carbon?
Ex 4: How many Fe atoms are in 675g of Fe?
3
...
7: Determining Formula of a Compound
Molecular Formula: Shows the smallest whole number ratio of atoms
Empirical Formula: shows the actual number of atoms present in the molecule
The goal: to find moles of every element present
Ex 6: Find the empirical and molecular formula given 38
...
74% Hydrogen, 51
...
With the molecular mass of 62
...
We change the percentages to grams
...
After finding all the
moles of each element we divide by the smallest mole found (shown in pink)
...
Now we know the empirical formula is
Now find the molecular formula by dividing the molecular mass given in the question by the empirical
mass
...
01) + 3(1
...
00 = 31
...
07/ 31 = 2
Multiply the empirical formula by 2 to give
3
...
For instance:
C + S CS2
C + S are the 2 reactants
...
The number in front of an element or compound is called the coefficient
...
2 is called the coefficient
...
Ex:
Combustion Analysis
Hydrocarbons – hydrogen’s with carbon’s attached
Ex: 1
...
40g CO2 and 2
...
What’s the
empirical formula?
3
...
Let’s use C + S CS2
We will be able to figure out whether C or S will run out first (the limiting reactant)
...
The bread will run out first, leaving
me with excess of 25 slices meat
...
0g Fe2O3 reacts with
10
...
295 is smaller than 35
...
29g Fe are formed
Percent Yield
Theoretical yield: what yield we predicted there would be
Actual yield: actual amount of product formed at the end of the experiment
Percent yield formula:
Ex: Magnesium carbonate (MgCO3) decomposes to form magnesium oxide (MgO) and carbon dioxide
(CO2)
...
What is the % yield of the reaction
Title: Stoichiometry
Description: Chem 1411 at lone star college north harris professor kenneth abayan. Also used the Zumdahl 10th editions chemistry book. This documents has notes and examples for stoichiometry including topics such as Avogadro's number, stoichiometry map, the mole, percent composition, empirical and molecular formula, chemical equations, balancing chemical equations, balancing hyrdocarbons, and percent yield. There are 7 pages of notes and an example for each for Chemistry 1. I use colors. I use a combination of lectures and zumdahl textbook to get my notes.
Description: Chem 1411 at lone star college north harris professor kenneth abayan. Also used the Zumdahl 10th editions chemistry book. This documents has notes and examples for stoichiometry including topics such as Avogadro's number, stoichiometry map, the mole, percent composition, empirical and molecular formula, chemical equations, balancing chemical equations, balancing hyrdocarbons, and percent yield. There are 7 pages of notes and an example for each for Chemistry 1. I use colors. I use a combination of lectures and zumdahl textbook to get my notes.