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