Answer
See explanation
Work Step by Step
The molar concentration $C_{\mathrm{i}}$ of the gas species $i$ in the solid at the interface $C_{\mathrm{i} \text {, solid side }}(0)$ is proportional to the partial pressure of the species $i$ in the gas $P_{\mathrm{i} \text {, gas side }}(0)$ on the gas side of the interface, and is determined from
$$
C_{\mathrm{i}, \text { solidside }}(0)=\mathrm{S} \times P_{\mathrm{i}, \text { gasside }}(0) \quad\left(\mathrm{kmol} / \mathrm{m}^3\right)
$$ where $\mathrm{S}$ is the solubility of the gas in that solid at the specified temperature.
