__ C_(6)H_(12)O_(6)+underline ( )O_(2)

This is a chemical reaction question. The given chemical equation is incomplete. The complete equation for the reaction of glucose (C6H12O6) with oxygen (O2) is:<br /><br />C6H12O6 + 6O2 -> 6CO2 + 6H2O<br /><br />This is a combustion reaction where glucose reacts with oxygen to produce carbon dioxide and water. The balanced chemical equation ensures that the law of conservation of mass is obeyed, meaning the number of atoms of each element is the same on both sides of the equation.