Answer:
If 5.9 moles of CO₂ react, 5.9 moles of CuO will also react.
Explanation:
The balanced reaction is:
CuO + CO₂ → CuCO₃
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
You can see that the stoichiometric relationship between CuO and CO₂ is 1: 1. In other words, for each mole of CuO that reacts, one mole of CO₂ will also react.
So if 5.9 moles of CO₂ react, 5.9 moles of CuO will also react.