Estimate the partial molar enthalpy of sulfuric acid at 140°F at the following two compositions using Figure P9-22. 

A. 30% by wt sulfuric acid 

B. 80% by wt sulfuric acid

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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- 190 K But Bu 0 10 20 30 40 50 60 70 80 Wt.% H₂SO4 FIGURE P9-22 Solution specific enthalpy of the sulfuric acid + water system at various temperatures. 90 100 Based on Smith, Van Ness, Abbott "introduction to Chemical Engineering Thermodynamics" 7th Edition, McGraw-Hill (Figure 12.17: Page 462).