Stoichiometry Just Do It.

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Presentation transcript:

Stoichiometry Just Do It

What is it? Stoichiometry is the mathematical relationship between 2 substances using coefficients from balanced chemical equations.

Why is it helpful? Stoichiometry can be used to mathematically determine how much reactant is needed or how much product will be formed, before going into the lab. The process of stoichiometry provides theoretical values through calculations. Experimental values can be obtained through lab and % error or % yield can be calculated.

% Yield Chemists like to know how right we are  % yield = (experiemental/theoretical) x 100 Experimental  lab results Theoretical  mathematical prediction through stoichiometry % error = |theoretical – experimental|/theoretical x 100 % error + % yield = 100

What Info Do You Need Before Doing Stoichiometry? You need a balanced chemical equation! Relationships between 2 different substances can be created through mole ratios and used to convert in a dimensional analysis problem.

Building Stoichiometric Relationships Fe (II) + CuCl2  Cu (II) + FeCl2 What mathematical relationships can be built from this balanced chemical equation related to iron? 1 mol Fe reacted 1 mol Cu produced 1 mol Fe reacted 1 mol CuCl2 reacted 1 mol Fe reacted 1 mol FeCl2 produced

Mole To Mole Conversions How many moles of copper can be produced from 6.8 moles of iron? Fe (II) + CuCl2  Cu (II) + FeCl2 6.8 mol Fe 1 mol Cu 6.8 mol Cu 1 mol Fe

Mole To Mole Conversions Continued How many moles of chlorine will be produced from the decomposition of .0093 moles of aluminum chloride? 2AlCl3  2Al + 3Cl2 .0093 mol AlCl3 3 mol Cl .014 mol Cl 2 mol AlCl3

More Mole To Mole Practice How many moles of hydrogen gas will be produced from 1.98 moles of sodium metal in water? Calculate % yield and % error if the experimental amount of hydrogen produced is .972 moles?

More Mole To Mole Practice Advanced How many moles of sodium chloride need to react with potassium chromate if 5.0 moles of precipitate are produced? Calculate % yield and % error if the experimental amount of sodium chloride used is 10.2 moles?