QuestionBalance this equation: $$-\mathrm{B}_{2} \mathrm{O}_{3}(\mathrm{~s})+\_\mathrm{HF}(\ell) \rightarrow-\mathrm{BF}_{3}(\mathrm{~s})+\ldots \mathrm{H}_{2} \mathrm{O}(\ell)$$
Though you would not normally do so, enter the coefficient of "1" if needed. $\square$ $\mathrm{B}_{2} \mathrm{O}_{3}(\mathrm{~s})$ $\square$ HF( $\ell$ ) $\square$ $\mathrm{BF}_{3}(\mathrm{~s})$ $\square$ $\mathrm{H}_{2} \mathrm{O}(\ell)$