Stoichiometry
Stoichiometry is the process of converting from one compound or element to another in a balanced chemical reaction. Stoichiometry problems follow 4 steps which are shown below:
STEP 1: Write a BALANCED Equation
STEP 2: Convert the GIVEN quantity to MOLES
Given grams? (1 mol / molar mass) Given liters? (1 mol / 22.4 L)
STEP 3: Use COEFFICIENTS to find the MOLE RATIO
(final compound / starting compound) ALWAYS (mol/mol)
STEP 4: Convert to the UNITS ASKED
Asked for grams? (molar mass / 1 mol) Asked for liters? (22.4 L / 1 mol)
STEP 1: Write a BALANCED Equation
STEP 2: Convert the GIVEN quantity to MOLES
Given grams? (1 mol / molar mass) Given liters? (1 mol / 22.4 L)
STEP 3: Use COEFFICIENTS to find the MOLE RATIO
(final compound / starting compound) ALWAYS (mol/mol)
STEP 4: Convert to the UNITS ASKED
Asked for grams? (molar mass / 1 mol) Asked for liters? (22.4 L / 1 mol)
Stoichiometry Example #1
How many grams of O2 will be formed when 3.75 g of KClO3 decomposes?
KClO3 --> O2 + KCl
KClO3 --> O2 + KCl