Consider loss of ethanol vapor by diffusion from a half-filled open te...
Explanation: At the liquid-gas interface concentration will be maximum.
Bulk liquid is not a part of the diffusion path.
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Consider loss of ethanol vapor by diffusion from a half-filled open te...
Loss of Ethanol Vapor by Diffusion from a Half-Filled Open Test Tube
Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. In the case of loss of ethanol vapor by diffusion from a half-filled open test tube, the ethanol molecules move from the liquid phase to the gas phase until the concentration of ethanol molecules in the gas phase reaches equilibrium with the liquid phase.
Bulk Flow Term
The bulk flow term is the contribution to the molar flux due to the movement of the fluid as a whole. It is caused by differences in pressure or concentration gradients. When there is a concentration gradient, the bulk flow term contributes to the molar flux by moving the fluid from an area of high concentration to an area of low concentration.
Maximum Contribution of Bulk Flow Term
The contribution of the bulk flow term to the molar flux will be maximum at the point where the concentration gradient is highest. In the case of loss of ethanol vapor by diffusion from a half-filled open test tube, the concentration gradient is highest at the liquid-gas interface. This is because the concentration of ethanol molecules is highest in the liquid phase and lowest in the gas phase. Therefore, the bulk flow term will contribute the most to the molar flux at the liquid-gas interface.
Conclusion
In conclusion, the contribution of the bulk flow term to the molar flux will be maximum at the liquid-gas interface in the case of loss of ethanol vapor by diffusion from a half-filled open test tube. This is because the concentration gradient is highest at this point, and the bulk flow term moves the fluid from an area of high concentration to an area of low concentration.