We use the formula for boiling point elevation, which is $\Delta T_{b}=K_{b} \times m$, where $K_{b}$ is the ebullioscopic constant for water (0.512°C/m) and $m$ is the molality of the solution (0.625m). So, we have:
\[\Delta T_{b}=0.512^{\circ} C / m \times 0.625
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