Stoichiometry.

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Presentation transcript:

Stoichiometry

Stoichiometry Calculating quantities in a chemical reaction Tricycle: A tricycle is composed of 1 frame and 3 wheels. If you have 1 doz frames, how many tricycles can you make? 1 doz or 12 tricycles If you have 1 doz wheels, how many tricycles can you make? 4 tricycles or 1/3 doz

If you have 1 mol of frames, how many tricycles can you make? 1 mol of tricycles If you have 100lbs of frames can you make 100 lbs of tricycles? NO! Not the same because they don’t weigh the same

2 moles of silver nitrate yields 1 mole of silver sulfide. 2 AgNO3 + H2S  Ag2S + 2 HNO3 2 moles of silver nitrate yields 1 mole of silver sulfide. 1 mole hydrogen sulfide yields 1 mole of silver sulfide. Conversion factors: 2 moles AgNO3 = 1 mol Ag2S 1 mol H2S = 1 mole Ag2S

1.75 mol Ag2S 2 AgNO3 + H2S  Ag2S + 2 HNO3 Q: How many moles of Ag2S will be produced from 3.5 moles of AgNO3? What happens if grams is involved? Use Molar Mass! 1.75 mol Ag2S

Q: How many grams of Ag2S will be produced from 3. 5 moles of AgNO3 Q: How many grams of Ag2S will be produced from 3.5 moles of AgNO3? A balanced chemical equation tells the mole:mole ratio between different compounds in the equation.

Tell-tale sign of Stoichiometry If you are given information about one substance and asked about a different substance, it is a stoichiometry problem.

Practice What is the mass of Mg(OH)2 that will react with 1.20g of HCl? Mg(OH)2 + HCl  MgCl2 + H2O 2 2 0.956g Mg(OH)2