Follow the steps of Sec. 14.4—that is, (1) identify the system, (2) determine whether the process is batch or rate, and so on.
A 2 200 lbm, finely ground mixture of salt and sand is to be separated by adding 1 500 lbm of water to dissolve the salt and then filtering the salt solution from the insoluble sand. The resulting salt solution is then separated by the distillation of 1 350 lbm of water, leaving a final solution that is 92% salt and 8.0% water. Determine the percentages of salt and sand in the original mixture.
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