Heat and Mass Transfer

In equimolar counter-diffusion (EMD) of water vapor ($A$) and air ($B$) across a stagnant boundary layer of thickness $\delta = 2.0\text{ mm}$ ($0.0020\text{ m}$) at total pressure $P = 101.325\text{ kPa}$ and $T = 298\text{ K}$ ($R = 8.314\text{ J/(mol}\cdot\text{K)}$), the molecular diffusivity is $D_{AB} = 2.60 \times 10^{-5}\text{ m}^2\text{/s}$. The partial pressure difference of water vapor is $\Delta p_A = 2.50\text{ kPa} = 2500\text{ Pa}$. Under steady state ($N_A = \frac{D_{AB} \Delta p_A}{R T \delta}$), the molar flux $N_A$ is ________ $\text{mmol/(m}^2\cdot\text{s)}$ (round off to two decimal places).