The combustion of butanol, C$4$H$10$O$,$ in the presence of oxygen gas $($O$2)$ produces CO$2$ and H$2$O in the following balanced equation:

C$4$H$10$O $+6$ O$2-->4$ CO$2+5$ H$2$O

If $(3\mathrm{.}660$x$10^1)$ g of C$4$H$10$O is added to $(4\mathrm{.}1$x$10^1)$ g of oxygen gas, how many grams of excess reactant is left over once the reaction has been completed?