Stoich for Dummies

What is stoichiometry?

Stoichiometry is basically a relationship between the relative quantities of reactants taking part in a chemical reaction.

In simpler terms, it's how much product you can make with a certain amount of reactant.

Stoich Beginnings

  1. Write out the reaction in a chemical equation form. Do this by determining the reactants and the product depending on the type of reaction.
  2. After setting up the equation, you must balance it so there is an equal amount of elements on each side.
  3. Then find the molar mass for each reactant and product in the equation. MOLAR MASS means finding one molecule of said element or compound.

Follow Along Problem

Reaction of Nitrogen and Hydrogen.

Mole to Mole

  1. Use dimensional analysis to convert the given moles of an element into the wanted moles.
  2. Follow the dimensional analysis chart.

Mass To Mass Conversions

  1. Plug the given values into the diagram and solve by multiplying across then dividing.
  2. Make sure inputed mass is molar mass of one molecule.

Limiting and Excess Reactants

  1. Find the mass to mass conversion with both given amount of reactants.
  2. Compare the answers and whichever has the smaller amount is the limiting reactant while the other is the excess reactant
By comparing your two results you'll see the Mole A which is nitrogen is the limiting reactant while Mole A2 which is hydrogen is the excess.

Theoretical Yield and Percent Yield

Theoretical yield is just the yield of the product using the limiting reactant. So in this case the theoretical yield would be 17.7 grams of Ammonia
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Percent yield is calculated using a formula. In our example problem the percent yield is 6.5 grams therefore our percent yield would be 44.2%

Ammonia in the Real World

Ammonia is used in metallurgical processes because it can be decomposed easily to yield hydrogen for wielding. It can also absorb a high degree of heat therefore it's useful as a coolant.

Made By Uyen (Vy) Nguyen

6th period