How many moles of oxygen can be formed from 67 grams of carbon dioxide?

Answer 1

Write the balanced decomposition reaction of CO₂.

CO₂ (g) → C (s) + O₂ (g)

Use stoichiometry to convert g of CO₂ to mol of O₂ by first converting g of CO₂ to mol of CO₂ using its MW followed by using the mole ratio of CO₂ to O₂ from the balanced reaction (1:1) to calculate mol of O₂.

67 g CO₂ x (1 mol CO₂ / 44 g CO₂) x (1 mol O₂ / 1 mol CO₂) = 1.5 mol O₂