Dinitrogen pentoxide decomposes in the gas phase to form nitrogen dioxide and oxygen gas. The reaction is first order in dinitrogen pentoxide and has a half-life of 2.81h at 25 ∘C If a 1.5 L reaction vessel initially contains 735 torr of N2O5 at 25 ∘C, what partial pressure of O2 will be present in the vessel after 230 minutes

4. Pure octane has a boiling point of 125.7 °C, but can be steam distilled with water at a tem- perature of 90 °C. Calculate the mass of octane that codistills with each gram of water and the percent composition of the vapor that is produced during the steam distillation. [Again, you'll need the vapor pressure of water at the steam distillation temp to solve this problem!] Note that if you multiply the second equation from question 3 above by the MW of both the oil and water, you get: mass oil/mass water = (P°) (MW)/ (Pwater) (MW water)

One kmol of benzene gas (C6H6) enters a combustion chamber designed to operate at steady state where it is mixed and burned with air. C,Hạ + a (O, +3.76N,)→ BCO, + yH,O+8N, Determine the following: 54. the balanced reaction equation for the theoretical amount of air, if the combustion products include CO2, H20 and N2, only. 55. the balanced reaction equation for 30 percent excess air, if all the hydrogen in the fuel burns to H20, but only 92 percent of the carbon burns to CO2, while the remaining 8 percent burns to CO. There is also some free Oz in the product gases. 56. the air-fuel ratio on a molar basis, in kmol air / kmol fuel (for 30 percent excess air); 57. the air-fuel ratio on a mass basis, in kg air / kg fuel (for 30 percent excess air); 58. the mass flow rate of the air entering the chamber, in kg air / min, if the fuel enters the chamber at a rate of 0.05 kg fuel / min (for 30 percent excess air); 59. the dew point temperature of the combustion products, in °C, when cooled…

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complete part E only

5. Hydrogen H2 is burned completely with the stoichiometric amount of air during a steady state, stead flow combustion process. If both reactants and products are maintained at 25 C and 1 atm, and the water in the products exists in the liquid form, determine the heat transfer from the combustion chamber during the process. What would your answer be if the combustion were achieved with 80% excess air ? Ans. (a) Q = 285,830 ku/kmol H2, (b) challenge *6 at 25 L