text: science quesation.? the formula for photosynthesis is 6co2+6h2o->c6h12o6+6o2.  how many atoms of each element(carbon,hydrogen,and oxygen)react in this equation?how many atoms of each are produced. this is really a chemistry question, not a physics question.  co2 is one c and two 0, so 6co2 is 6 c and 12 o h2o is 2 h and one o so 6h2o is 12 h and 6 o the total is 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms.  c6h12o6 is 6 c, 12 h and 6 o o2 is 2 o, so 6o2 is 12 o the total is 6 carbon atoms, 12 hydrogen atoms and 18 oxygen atoms.  since both sides are the same the equations is balanced.