A nice introduction to chemical engineering calculations is provided by Felder, R. M., and R. Rousseau , Elementary Principles of Chemical Processes, 2nd ed. Wiley, New York (1986).
Excellent discussions of the issues involved in modeling a mixing tank, incorporating density effects and energy balances, is provided in the following two books: Denn, M. M. , Process Modeling, Longman, New York (1986); Russell, T.R. F., and M. M. Denn , Introduction to Chemical Engineering Analysis, Wiley, New York (1971).
An introduction to chemical reaction engineering is Fogler, H. S. , Elements of Chemical Reaction Engineering, 3rd ed., Prentice Hall, Englewood Cliffs, NJ (1999).
An excellent textbook for an introduction to chemical engineering thermodynamics ...