Samantha L. and Jacky P.

Stoichiometry is using the amounts of chemicals in one chemical
reaction to find the amounts of chemicals in another chemical reaction.


To find this follow these simple steps
1.Write a complete and balanced chemical equation2. Draw a column after each chemical.
3. Write the amount given in the correct column.
4. Convert the amount given into moles.

  • In each of the other columns write moles of given (x) as a fraction.
  • The numerator of the fraction is the coefficient of the column.
  • The denominator of the fraction is the coefficient of the given column.
  • Do math and label as moles.

6. Convert all moles into grams.
7. Verify the law of conservation of mass

Law of Conservation of Mass- States that mass can neither be created or destroyed during any ordinary chemical reaction.

  • NOTE: This means the total mass of the reactants and the total mass of the products must be equal. (The last significant digit can vary by 2)

To review the slide show click link below.

Example Problems and Answers
(follow powerpoint if you need extra help!)

1. How many moles of chlorine gas would react with 5 moles of Sodium?
Answer: 2.5 moles
2. How much silver sulfide can be created from .00123 grams hydrogen sulfide? Answer: .00897 grams silver sulfide

Click here for additional stoichiometry problems and their solutions,

Balancing Equations :)
Gram - Mole Conversions :)
Significant Digits :)
these pages made by other chemistry II students!