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# Welcome to Stoichiometry

Mole-Mole Calculations
by

## Rachel Esquibel

on 8 January 2016

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#### Transcript of Welcome to Stoichiometry

Welcome to Stoichiometry
Date Lecture/Activity pg#
Chocolate Chip Cookie Recipe
2.25 cups flour
8 Tbsp butter
0.5 cups shortening
0.75 cups sugar
0.75 cups brown sugar
1 tsp salt
1 tsp baking soda
1 tsp vanilla
0.5 cups Egg Beaters
2.25 cups flour + 8 Tbsp butter + 0.5 cups shortening +
0.75 cups sugar + 0.75 cups brown sugar + 1 tsp salt +
1 tsp baking soda + 1 tsp vanilla + 0.5 cups Egg Beaters
one batch of chocolate chip cookies
1 Batch of Cookies:
2.25 cups flour
8 Tbsp butter
0.5 cups shortening
0.75 cups sugar
0.75 cups brown sugar
1 tsp salt
1 tsp baking soda
1 tsp vanilla
0.5 cups Egg Beaters
I have 1.5 cups of Egg Beaters.
How many batches of cookies can I make with that many Egg Beaters?
What is Stoichiometry?
The study of the quantitative relationships in chemical reactions.
*Balanced reactions are key to solving stoichiometric problems
*You need to know:
How to write formula units & molecular formulas
How to calculate Molar Mass & Formula Mass
Molar Conversion: Mass, Mole, Atoms
Determining the Mole-Ratio
Mole-Ratio: shows the relationship between two different reactants or products in a chemical reaction.
*Indicated by the coefficients in a balanced reaction
2 Mg + O2 --> 2MgO
What is the mole ratio between oxygen and magnesium oxide?
Mole Ratio Examples
2 KClO3 --> 2 KCl + 3O2
What is the mole ratio between KClO3 and KCl?
Cu + 2AgNO3 --> Cu(NO3)2 + 2Ag
What is the mole ratio between Copper and silver?
Mass
Moles
# atoms
Molar Conversion Chart
Molar/Formula Mass
____g = 1 mol
6.02x10^23 = 1 mol
Mole to Mole
Step 1: Write a BALANCED EQUATION
Step 2: Determine known & unknowns
Step 3: Determine the mole ratio using the coefficients in the equation.
Step 4: Set up the problem like a unit conversion and solve!
Template
Steps:
given moles
known
moles of
unknown
moles of
known
Mole to Mole Practice
2H2 + O2 --> 2H2O
How many moles of water can be formed from 0.5 moles of hydrogen?
3CuSO4 + 2Al --> Al2(SO4)3 + 3Cu
How many moles of copper II sulfate are required to react with 1.5 moles of aluminum?
Mole to Mole Practice
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
How many moles of calcium are required to produce 10 moles of aluminum?
1. 01/19/16 Welcome to Stoichiometry 1
Objective:
Today I will record the steps required to complete stoichiometric calculations so that I can perform conversions from one mole to another mole of a different element/compound.

Agenda:
Welcome to Stoichiometry - Lecture

ChemCatalyst:
How many atoms are in 52.0 g of Calcium Sulfide?
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