How much steam is required for each pound mass of entering acid?

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Saturated steam at 40 psia is throttled to 1 atm and mixed adiabatically with (and condensed by) 45-wt-% sulfuric acid at 80oF in a flow process that raises the temperature of the acid to 160oF. How much steam is required for each pound mass of entering acid, and what is the concentration of the hot acid?

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