Answer
See explanation
Work Step by Step
Using solubility data of a solid in a specified liquid, the mass fraction of the solid $A$ in the liquid at the interface at a specified temperature can be determined from
$$
\mathrm{mf}_A=\frac{m_{\text {solid }}}{m_{\text {solid }}+m_{\text {liquid }}}
$$ where $m_{\text {solid }}$ is the maximum amount of solid dissolved in the liquid of mass $m_{\text {liquid }}$ at the specified temperature.
