In a test of rocket propellant performance, liquid hydrazine (n2h4) at 100 kpa, 25 °c, and oxygen gas (o2) at 100 kpa, 25 °c, are fed to a combustion chamber in the ratio of 0.4 kg o2 to 1 kg n2h4. the heat transfer from the chamber to the surroundings is estimated to be 200 kj per kmol of n2h4. assume that only gaseous h2o, h2, and n2 are present in the products. the enthalpy of formation of liquid hydrazine is +50,417 kj/kmol.