a_Chinese_Student When I input 'NO+CO+O2=CO2+N2', the program returns' 4NO+2CO+-1O2 → 2CO2+2N2 '. I think this is a wrong result. The correct answer should be "2NO+6CO+2O2=6CO2+N2". If this is my problem, I will be very sorry.
Admin This equation can be balanced in an infinite number of ways, and the calculator tries to force one that works mathematically, unfortunately it's not the best answer as you've pointed out.