If the CaCO3 weighed 983 g and the CaO weighed 551 g, how many grams of CO2 were formed in the reaction?

The answer to your question is 432 g of CO₂

Explanation:

Data

CaCO₃ = 983 g

CaO = 551 g

CO₂ = ?

Balanced reaction

CaCO₃ (s) ⇒ CaO (s) + CO₂ (g)

This reaction is balanced, to solve this problem just remember the Lavoisier Law of conservation of mass that states that the mass of the reactants is equal to the mass of the products.

Mass of reactants = Mass of products

Mass of CaCO₃ = Mass of CaO + Mass of CO₂

Solve for CO₂

Mass of CO₂ = Mass of CaCO₃ - Mass of CaO

Mass of CO₂ = 983 g - 551 g

Simplification

Mass of CO₂ = 432 g