Glucose + Oxygen -> Carbon Dioxide + Water (+heat). C6H12O6 + O2 -> CO2 +H2O (+heat). To balance this equation (i.e. to have equal numbers of atoms on both sides of the equation), goes as follows C6H12O6 + 6O2 -> 6CO2 +6H2O. Here we can see there are 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms now on each side of our equation.