Stoichiometry Ch 9.

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Presentation transcript:

Stoichiometry Ch 9

Stoichiometry Stoichiometry is the accounting, or math, behind chemistry. Given enough information, one can use stoichiometry to calculate masses, moles, and percents within a chemical equation.

Stoichiometry Is used in a lot of places It’s used in recipes It’s used in industry

Stoichiometry The same method works in chemistry as well as it does in cookies. In a chemical reaction, coefficients mean something. They tell the amount of substance that is there ATOMS, MOLECULES, MOLES

Mole Ratio BaCl2 + H2SO4 → BaSO4 + HCl BaCl2 + H2SO4 → BaSO4 + 2HCl What is the mole ratio of Barium sulfate to hydrogen chloride? 1mol BaSO4 2 mol HCl

Doing stoichiometry: the steps 1. Convert mass of given to moles. 2. Use mole ratio to convert moles of given to moles of unknown. 3. Convert moles of unknown to mass of unknown. STEP 1 STEP 2 STEP 3 mass of GIVEN 1 mol GIVEN moles of UNKNOWN from Balanced Eqn Molar Mass of UNKNOWN Molar Mass of GIVEN moles of GIVEN from Balanced Eqn 1 mol UNKNOWN

Another Place to Read About It http://misterguch.brinkster.net/stoichiometryexplained.pdf It’s a good website that can help you understand what stoichiometry is all about.