STOICHIOMETRY

# STOICHIOMETRY - STOICHIOMETRY What is stoichiometry...

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STOICHIOMETRY

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What is stoichiometry? Stoichiometry is the quantitative study of reactants and products in a chemical reaction.
What You Should Expect Given : Amount of reactants Question: how much of products can be formed. Example 2 A + 2B 3C Given 20.0 grams of A and sufficient B, how many grams of C can be produced?

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What do you need? You will need to use i. molar ratios, ii. molar masses, iii. balancing and interpreting equations, and iv. conversions between grams and moles. Note: This type of problem is often called "mass-mass."
Steps Involved in Solving Mass-Mass Stoichiometry Problems Balance the chemical equation correctly Using the molar mass of the given substance, convert the mass given to moles. Construct a molar proportion (two molar ratios set equal to each other) Using the molar mass of the unknown substance, convert the moles just calculated to mass.

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Mole Ratios A mole ratio converts moles of one compound in a balanced chemical equation into moles of another compound.
Example Reaction between magnesium and oxygen to form magnesium oxide. ( fireworks) 2 Mg(s) + O2(g) 2 MgO(s) Mole Ratios: 2 : 1 : 2

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STOICHIOMETRY - STOICHIOMETRY What is stoichiometry...

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