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Stoichiometry

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Stoichiometry

- All stoichiometry problems start with a balanced equation.
- You must check for this!
- If it is not balanced, BALANCE IT!

S

Fe

Fe2S3

S

Fe

S

- Can change coefficients but CANNOT change subscripts
- Example
- 3S + 2 Fe Fe2S3

- Al + CuO Al2O3 + Cu
- ____________________________

- H2 + O2 H2O
_______________________

- Remember what an equation actually means
- Mg + S MgS
- One _____________reacts with one ___________ creating one formula unit of MgS

- But
- This also means that one mole of _________ reacts with one mole of ___________ to form one mole of _______ formula units.
- 1 mol Mg, 1 mol S, and 1 mol MgS are stoichiometry equivalents

- What about the equation
- C3H8 + 5O2 3CO2 + 4H2O
- Now, ____ mol C3H8, _____ mol O2, _____ mol CO2, and _______ mol H2O are stoichiometry equivalents

- As stoichiometry equivalents, they can be used in a conversion factor
- __________________ Conversion Factors
- One equivalent is placed on top and one on bottom
- Allows us to move from one compound to another in a balanced equation

Given the equation:

MgCl2 + 2 AgNO3 Mg(NO3)2 + 2 AgCl

What is the mass of AgCl produced if 24g of MgCl2 is reacted with excess AgNO3?

What amount of MgCl2 will react with 3.85 g AgNO3?

- So far we have been assuming that we have an excess of all the other reactants
- This is not often true….often you have a set amount of both reactants
- Each amount would lead you to a different amount of product
- Must use the number that is ___________

Given the equation:

MgCl2 + 2 AgNO3 Mg(NO3)2 + 2 AgCl

How much AgCl will be produced if 28g of MgCl2 is reacted with 51g of AgNO3?

- Yield is the amount of product that you get from a reaction
- Theoretical yield is the amount that you should get based on using stoichiometry
- Actual yield is the amount of product actually attained during an experiment

- Calculated by taking
- _____________________________________

Given the equation:

MgCl2 + 2 AgNO3 Mg(NO3)2 + 2 AgCl

What is the percent yield of Mg(NO3)2 if 168.4 g of AgNO3 is reacted to produce 47.2g of Mg(NO3)2?