Question

Topic 12 Homework C2 Homework . Due on November 11, 2019 Fill in the Blanks Additional Thermodynamic Data Sº Substance CH2NOZ (1) CH NO2 (g) SO3 (s) S03 (1) Soz (g) ΔΗ, (25°C kJ/mol -112.6 -74.3 -454.5 -441.0 -395.7 AGO (25°C kJ/mol) (25°C J/mol-K) -14.6 171.8 -6.8 275.0 -374.2 70.7 -373.8 113.8 256.8 371.1 Compute Pvap for nitromethane at 15°C and 70°C. Pvap at 15°C = Pvap at 75°C = Fullscreen

Answer 1

Answer According to clausius - clapeyron equation for liquid - vapour equilibrium - en (P2) - - attrap (1 1 - 1 / 1 ) temperature (ink) Where P2 is vapour pressure at Tz temperatur P, is Vapour pressure at T temperature in 4Hvap is molar enthalpy of vapourization. Let's assume, for nitromethane atvap does not depend on temperature and equal to 4H (vap) CH₃ NO₂ (1) - CH₂ NO2 (3) 4 Hirap) & Ang (CH₂ NO2)2 – sty (CH₃ NO2). (-74.3 + 112.6) kJ/mol = 38.3 kJ/mol • R (gas constant) = 8.314 J/molk Ty = (273+15) K = 288k, "T, > (273 +25)k P, = 1 atm (at standard state). in() -32 o Lee] a, en (P2) - -0.5368 a P2 = 0.585 so Prap at 15e = 0.585 atm. T2 = (273+75) K = 348K , TI = (273 +25)k P, - 1 atm (at standard state) • = 298k

in(?). -383310348-] a la P2) = 2.221 a P2 = 9.22 50g Prap at 750 = 9.22 aton