How many moles of CO2 are produced when 5.15 lol of ethane are burned in an excess of oxygen How many moles of CO2 are produced when 5.15 lol of ethane are burned in an excess of oxygen Solution Answer: The balanced reaction for the combustion of ethane is 2C6H6 + 7O2 ------> 4CO2 + 6H2O The mole ratio between ethane C2H6 : CO2 = 2:4 or 1:2 Given moles of C2H6=5.15 mol with excess O2. Therefore moles of CO2 produced = 2 x moles of C2H6=2 x 5.15 mol Moles of CO2 produced=10.3 mol CO2. Thanks and I hope you like it. .