When entering coefficients to balance equations, recall that just writing the symbol implies "1." Therefore, if a coefficient of "1" is required, choose "blank" for that box.
the balanced equation for the combustion reaction is as follows 4C₂H₅ + 13O₂ --> 8CO₂ + 10H₂O coefficients for the reactants and products are C₂H₅ - 4 O₂ - 13 CO₂ - 8 H₂O - 10