Why is the molar flux in gas is less then liquid?

The molar flux in gases is typically less than in liquids due to the lower density and higher compressibility of gases, which results in fewer molecules per unit volume. Additionally, the diffusion coefficients in liquids are generally higher than in gases, allowing for more efficient transport of molecules. This means that even though gases can diffuse quickly, the overall number of moles moving through a given area in unit time is often lower compared to liquids.