For the given chemical equation, write the necessary stoichiometric coefficients to
balance the equation. Note that normally we wouldn't write a coefficient of one,
however you must include a coefficient of one if appropriate to not lose points.
$$1C_8H_{18}(l) + \frac{25}{2}O_2(g) \longrightarrow 8CO_2(g) + 9H_2O(g)$$