A Guide to Stoich

Jordyn Galvan 5th Period Miller Chemistry PreAp

Vocabulary That You Need To Know:

What is a mole?

One mole contains 6.022 x 1023 things (atoms, molecules, ions etc).

What is Stoichiometry?

the relationship between the relative quantities of substances taking part in a reaction or forming a compound, typically a ratio of whole integers.

What is a Coefficient?

Coefficients are the numbers placed before the reactants in a chemical equation so that the number of atoms in the products on the right side of the equation are equal to the number of atoms in the reactants on the left side.

What is a conversion factor?

A ratio of coefficients found in a balanced reaction, which can be used to inter-convert the amount of products and reactants.

Example: Hydrochloric Acid and Calcium Hydroxide- Double Replacement

H2Cl + Ca(OH)2----> CaCl2 + H20

Balanced Equation: 2HCl+ Ca (OH)2 ----> CaCl2 + H2O

When balancing this equation you will need to put a coefficient of 2 in front of HCl on the reactant side of the arrow in order to balance the amount of Calcium on the product side of the arrow. This also levels the amount of Hydrogen on each side.

IPUAC name for each reactant and product:

hydrogen chloride+ calcium dihydroxide-----> water + calcium dichloride

Conversions: mole to mole, mass to mass, limiting and excess reactant, theoretical yield, percent yield

Mole to Mole:

10.19m Hcl * 1 CaCl2 / 2 HCl = 5.095

Mass to Mass:

12.1*1HCl*2H2O *2.016g/ 110.98/2HCl/1m + 3.44

Limiting Excess Reactant:

12.3g HCl* 1 *1 *110.98/36.461/2/1 = 74.88

Theoretical Yield:


Percent Yield: 2.1g/ 3.44 *100 = 61.046

Mole to Mole and Mass to Mass video

What is Stoichiometry?

Limiting, Excess, Theoretical Yield,Percent Yield

Limiting Reagent, Theoretical Yield, and Percent Yield