limiting reactantLimiting reactantLimiting reactant

Identify the limiting reactant when 1.22g of O2 reacts with 1.05g of H2 to produce water?

A vessel contains 3.4g EACH of CO and O2. How many moles of CO2would you expect to recover based on the number of moles of each reactant?
2CO+ O2= 2CO2

How much O2 could be produced from 2.47g of KO2 and 4.52g of CO2?