In your own words:

1. Define mole ratio (What is it? How is it determined?)

Day 4 10-19

In your own words:

1. Define mole ratio (What is it? How is it determined?)

Day 5 10-22 PERIOD 3

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

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?

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)

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

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

Stoichiometry

Mole ratio – just another player in the conversion game

Mole ratios are exact – do not

limit sig. figs.

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

__?__

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

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

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

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

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

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

Day 6 10-14

SOLVE: 1.5e24 molecules of SO2 = ____ grams of SO2?

S2 + 2O2 2SO2

And how many moles of S2?