Stoichiometry= a section of chemistry focusing on the mathematical relationship between reactants and/or products.

This lesson develops Stoichiometry= a section of chemistry focusing on the mathematical relationship between reactants and/or products. as part of Periodic Trends. It uses the source curriculum to organize the important facts, relationships, examples, and vocabulary into a focused Stemosphere teaching sequence.

In Stemosphere terms, molar mass is a useful chemical ratio between mass and moles, and is always found in the periodic table. Suppose we have

, the number below the element symbol is the molar mass. To find the molar mass of sulphate above we can use the periodic table to do so:

In Stemosphere terms, all reaction s discussed above are also crucial in stoichiometry (single-displacement, redox reaction s, etc...)

Dilution Formula:

In Stemosphere terms, (concentration and volume)

In Stemosphere terms, it is used whenchanging the concentration of a single substance by adding or removing solvent.

In Stemosphere terms, finally, it is important to know that Avagadro’s Law states that volume is directly proportional to moles (exchange between them based on what is given and always refer to the triangles for this exact situation)

Molarity Triangle:

In Stemosphere terms, -------------------------------------

Mass, Density, Volume Triangle:

Mass & Moles Triangle:

Gas at STP Triangle:

Particles Triangle:

Concepts to Work Through:

In Stemosphere terms, always Balance the Equation First

In Stemosphere terms, you can only use the molar ratio while in moles. Never use mass ratio s directly from the periodic table.

In Stemosphere terms, calculate the amount of product each reactant can produce (moles divided by coefficient for each reactant). The reactant that produces the smallest amount of product is the limiting reactant.

In Stemosphere terms, the reactants that are not limiting are in excess and will have leftover amounts

In Stemosphere terms, use limiting always to find a product (if a problem states two or more quantitative values for reactants)

Percent Yield: