Question

Which single substance in the above equation is repeated in raw material as well as reproduced as the end product

Answer 1

Please comment the equation mate, You have forgot to mention the equation.

Answer 2

Answer:

Water

Explanation:You were going to write 6CO2 + 12H20 ---->C6H12O6 + 6H2O + 6O2        

so it means H20 is repeated in both the sides(reaction and products) !

GG