Question

Could someone please guide me through these problems? Correct answers are highlighted.

9. Calculate the total vapor pressure (in Torr) at 50°C of an ideal solution of methanol (CH3OH) and propanol (C3H7OH) in which the mass % concentration of methanol is 58.0%. The vapor pressure at 50°C of methanol is 416.3 Torr and that of propanol is 179.3 Torr. d) 315.8 b) 278.8 a) 350.3 c) 300.3 e) 239.8 12. The standard enthalpy of combustion of acetic acid, CH3COOH (1), is -875 kJ/mol. The standard enthalpies of formation of H2O (1) and CO2 (g) are - 285.83 and -393.51 kJ/mol, respectively. What is the standard enthalpy of formation of acetic acid, in kJ/mol? a) -484 b) +196 c) +1554 d) - 198 e) - 249 14. Calculate the final temperature when 4.00 kJ of energy is transferred as heat to 1.50 mol BF3 at 298 K and 1 atm at constant pressure. (Hint: Assume only translational and rotational motions are excited at these temperatures) B) 353 K C) 405 K D) 418 K E) 354 K A) 378 K

Answer 1

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be Can enpиn ed The мatten coa) + trdnan tи ериaноn (I0H Balandng the 200, (9) 20 (2). Сha LooH Ca) t 20 Enthelay of Aor mation produt си Cри) Co, C9 2 x 2 2x 393) 87J 87S 787. 02 1358.68 87 Y83.6 ks/ mol. Cnthalpy f

(14) Hhat SruiffHeatof BF3 tronalahion & rotahinl mohon (Tuluding Tisitat 4 R Tral AT 2 AT m C AT = 1-XИX &3J4 1.5XЧXR 80-18 80.18 Tret Tinitha 28 t 80.1R Tin 378k Thinal