Answer:
132g
Explanation:
The reaction equation is given as:
     CaCO₃  →  CaO  + CO₂
Given;
 Number of moles of CaCO₃  = 3 moles
Unknown:
Mass of CO₂ produced  = ?
Solution:
From the balanced reaction equation;
     1 mole of CaCO₃ will produce 1 mole of CO₂;
     3 mole of CaCO₃ will then produce 3 moles of CO₂
To find the mass of COâ‚‚;
 Mass of CO₂ = number of moles x molar mass
   Molar mass of CO₂  = 12 + 2(16) = 44g/mol
 Mass of CO₂ = 3 x 44  = 132g
