Stoichiometry

mreisley

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Presentation Description

The process for mass-mass stoichiometry calculations is discussed.

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Stoichiometry:

Stoichiometry deals with the amount of substances involved in chemical reactions, both reactants and products Balanced chemical equations relate number of particles reacting Each particle has its own mass  must be able to relate masses of reactants to masses of products

Mass – Mass Problems 4 steps::

Mass – Mass Problems 4 steps: Write the balanced equation Convert grams to moles of a starting material Determine the ratio of moles of the starting material and the final material (from balanced equation) Convert moles to grams of the final material

Solving Mass-Mass Problems Visually:

Solving Mass-Mass Problems Visually G.o.S.M. M.o.S.M. M.o.F.M. G.o.F.M. Molar Mass of Starting Material Molar Mass of Final Material Mole Ratio of Starting Material to Final Material

Example Problems:

Example Problems How many grams of Cu 2 S could be produced from 9.90 g CuCl reacting with an excess of H 2 S gas? H 2 S (g) + 2 CuCl (s)  Cu 2 S (s) + 2 HCl (g)

Example Problem:

Example Problem How many grams of Ca(OH) 2 will be needed to react completely with 10.0g H 3 PO 4 ? 3 Ca(OH) 2(aq) + 2 H 3 PO 4(aq)  Ca 3 (PO 4 ) 2(s) + 6 H 2 O (l)