At 80°F, we mix 10 lb_m of sulfuric acid with 20 lb_m of water. What is the resulting heat of mixing for this process? Is the heat liberated or absorbed? Use Figure P9-22.

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H (Btu)/(lb) solution 140 120 100 80 60 40 20 O -20 -40 -60 -80 -100 -120 -140 200 (F) 180- 100 KAN gline 0 10 20 30 40 50 60 70 80 90 100 Wt.% H₂SO4 FIGURE P9-22 Solution specific enthalpy of the sulfuric acid + water system at various temperatures. Based on Smith, Van Ness, Abbott "Introduction to Chemical Engineering Thermodynamics" 7th Edition, McGraw-Hill (Figure 12.17: Page 462).