Mole-mole Stoich

Steps to mole-mole problems:

1. Identify what information we are given and what we need to find.

given: ⅔ of a mole of CO₂ , find: moles of O₂

2. Create a conversion factor or stoichiometric ratio from the balanced equation.

We need 2 oxygen for each 1 carbon dioxide.

2O₂/CO₂

3. Multiply the given by the conversion factor.

⅔ CO₂ x 2O₂/CO₂ = 4/3 O₂ *

*Notice that the only unit leftover is O₂ because there is CO₂ in the numerator and denominator, and therefore cancel out.