in your own words: 1. define mole ratio (what is it? how is it determined?) day 4 10-19
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In your own words:
1. Define mole ratio (What is it? How is it determined?)
Day 4 10-19
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In your own words:
1. Define mole ratio (What is it? How is it determined?)
Day 5 10-22 PERIOD 3
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At STP 44.8 liters of water vapor were produced via a composition (synthesis) reaction. How many moles of O2 were used?
Day 5 10-22 PERIOD 1
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2Al(s) + 3CuCl2(aq) 2AlCl3(aq) + 3Cu(s)
According to the reaction above if you start with about 27 grams of aluminum how much copper should you produce (in grams)?
What is this calculation called?
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Stoichiometry
Reaction Stoichiometry – relates quantities of reactants and products in chemical reactions
Mole ratio – conversion factor that relates the amounts in moles of any two substances involved in a chemical rxn
Example:4NH3(g) + 6NO(g) 5N2(g) + 6H2O(l)
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Stoichiometry
Mole ratio – just another player in the conversion game
- Used to change from one substance to another
- Does NOT change units
- Does change substance
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Converting:Mass to moles
Moles to mass
Moles to atoms / molecules / particles
Atoms / molecules / partilces to moles
Moles to liters
Liters to moles
Changing a substance
=
=
Molar mass
Avogadro’s number
=Avogadro’s law
= Mole ratio
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Stoichiometry
Mole ratio – just another player in the conversion game
Mole ratios are exact – do not
limit sig. figs.
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Stoichiometry
4NH3(g) + 6NO(g) 5N2(g) + 6H2O(l)
Start with 20 mols NH3 mols N2
Start with 20 grams NH3 moles NO
Start with 20 grams NO grams N2
__?__
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Stoichiometry
Start with 20 mols NH3 molecules N2
Start with 20 grams NH3 molecules NO
__?__
4NH3(g) + 6NO(g) 5N2(g) + 6H2O(l)
Start pd 1
1.5e25 molecules N2
1.1e24 molecules NO
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STEPS FOR SOLVING:1. Identify the Balanced chemical equation
2. Identify what you know and what you need to know
3. Get an idea of what you need to do
4. Start your conversion
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At STP 44.8 liters of water vapor were produced via a composition (synthesis) reaction. How many moles of O2 were used?
Day 6 10-23 PERIOD 3
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If you produce 116 grams of sodium chloride by reacting sodium and chlorine how many mols of sodium must you have used?
2Na + Cl2 → 2NaCl
116 g NaCl = ____ mols Na
answer = 2 mols Na
Stoichiometry
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Cupric chloride decomposes and 127 grams of solid copper form. How many liters of chlorine gas are produced at STP?
CuCl2 → Cu + Cl2
127 g Cu = ____ liters Cl2
answer = 44.8 liters Cl2
Stoichiometry
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Limiting Reactant – the reactant that limits the amounts of the other reactants that can combine and the amount of product that can form in a chemical reaction – the one you will run out of
Excess Reactant – any substance that is not used up completely in a reaction – left over
Limiting Reactants
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Day 6 10-14
SOLVE: 1.5e24 molecules of SO2 = ____ grams of SO2?
S2 + 2O2 2SO2
And how many moles of S2?
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