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The Math of Chemical Reactions—Stoichiometry

Topic Review on "Title":

Stoichiometry is the culmination of many concepts in chemistry.  It integrates dimensional analysis, moles and molar mass, molar volumes of gases, concentrations and balanced chemical equations to use information about one species in a reaction to determine information about another species in the same reaction.

Chemical equations are used to relate reactants and products in a chemical reaction.  Dimensional analysis is a technique that uses ratios of equivalents to convert units.  The KUDOS method is a method for solving word problems.  Molarity is a concentration unit showing the ratio of moles of solute to volume of solution.

Mole-Mole problems
The balanced equation gives the ratio of moles of each species in the reaction.  The balanced equation is used to determine mole ratios for use in dimensional analysis when converting from the moles of one species to the moles of another.  Moles is the only unit that may be used to convert from one chemical to another—mass or volume cannot be used to convert between chemicals, just within the same one.

Mole-Mass & Mass-Mass problems
Molar mass is an equivalent between the mass in grams and moles of a substance.  The molar mass is used to convert between moles of a substance and mass in a stoichiometry problem.

Mole-Volume problems for solutions
The concentration, in molarity, of a solution gives the equivalent for moles of the solute and liters of solution.  The molarity can be used to convert between moles and volume of a solution in stoichiometry problems.

Mole-Volume problems for gases
The volume of 1 mole of any gas at standard temperature and pressure is 22.4 L.  The molar volume of a gas can be used to convert between moles and volume of a gas at STP in stoichiometry problems.  If a problem asks for the volume at non-standard temperature or pressure, find the STP volume using stoichiometry and then use the appropriate gas law to convert to the desired temperature or pressure.

Rapid Study Kit for "Title":
Flash Movie Flash Game Flash Card
Core Concept Tutorial Problem Solving Drill Review Cheat Sheet

"Title" Tutorial Summary :

Stoichiometry uses the principles of dimensional analysis to use information about one species in a chemical reaction to determine information about a different species in the same reaction.  This tutorial guides you through stoichiometric calculations involving moles, mass, solution volume and gas volume.

Tutorial Features:

Specific Tutorial Features:

  • Use of real-life analogies to explain stoichiometric concepts

Series Features:

  • Concept map showing inter-connections of new concepts in this tutorial and those previously introduced.
  • Definition slides introduce terms as they are needed.
  • Visual representation of concepts
  • Animated examples—worked out step by step
  • A concise summary is given at the conclusion of the tutorial.

"Title" Topic List:
  • Review
    • Chemical equations
    • Dimensional Analysis
    • KUDOS method
    • Molarity
  • Stoichiometry
    • Mole-Mole problems
    • Mole-mass problems
    • Mass-mass problems
    • Mole-volume problems for solutions
    • Mole-volume problems for gases

See all 24 lessons in college chemistry, including concept tutorials, problem drills and cheat sheets:
Learn Yourself to Teach Chemistry Visually in 24 Hours

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