ΔΗ Ξ Ideal gas: exact f GT)ar Nearly ideal gas: approximate for variable P Τι Nonideal gas: exact only if P is constant (8.3-10a) Τ ΔΗ ~ ΥΔΡΑ corsar Solid or liquid (8.3-10b) Liquids and Solids: Cp ~ Cy Ideal Gases: Cp = C + R Δύ T₂ C₁(T) dT (True path) ΔΗ, ΔΗ, ΔΗ Ideal gas: exact Solid or liquid: good approximation Nonideal gas: valid only if V is constant FIN ΔΗ ΔΗ ΔΗ, ΔΗΑ Form 1: Cp[kJ/(mol·°C)] or [kJ/(mol·K)] = a + bT + cT² + dT³ Form 2: Cp[kJ/(mol·°C)] or [kJ/(mol·K)] = a + bT + cT−2 Example: (Cp)acetone(g) = 0.07196 + (20.10 × 10-5)T - (12.78 × 10−8)7² + (34.76 × 10-12)73, where T is in °C. Mol. Temp. Range (Units Compound Formula Wt. State Form Unit a X 10³ b x 105 cx 108 d x 1012 of T) Benzene C6H6 78.11 1 1 °C 126.5 23.4 6-67 g 1 °C 74.06 32.95 -25.20 77.57 0-1200

Calculate the change in enthalpy ΔH for 100 kg of material undergoing the following temperature and phase changes.  Show your calculations in detail (including the integrations) type them out in word.

1. benzene in liquid state heated from 20 °C, 1 atm to vapor at 120 °C, 1 atm. Include in your solution for this problem a diagram of the process path. (piecemeal)