The combustion of octane, $C_8{H}_{18},$ in the presence of oxygen gas $(O_2)$ produces $C{O}_2$ and $H_{2}O$ in the following balanced equation:

$2C_8{H}_{18}+25O_{2}16C{O}_2+18H_{2}O$

If $(4\mathrm{.}8{10}^{{?}^{{?}^{?}}}1)g$ of $C_8{H}_{18}$ is added to $(1\mathrm{.}38{10}^{{?}^{{?}^{?}}}2)g$ of oxygen gas, how many grams of excess reactant is left over once the reaction has been completed?

Note: Your answer is assumed to be reduced to the highest power possible.

Your Answer:

$x10$

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