"What are the key principles of mass transfer in chemical engineering processes? Discuss the factors influencing mass transfer coefficients and the different mass transfer mechanisms. Explain the applications of mass transfer in industrial processes, such as distillation, absorption$,$ and extraction. How does mass transfer contribute to the design and optimization of chemical reactors? Provide examples illustrating the importance of mass transfer in improving process efficiency and product quality. How do engineers address mass transfer limitations in various unit operations?"