Answer:
0.90molCO2
Explanation:
You create a balanced equation of the two reactants and one product
2CO+O2=2CO2
Then you convert both reactants into moles of the product and the smaller number is the maximum amount of moles of the product you can create. This is because there is only enough of that one product to make the certain amount of moles, the other product will just have some left over.