Estimate through calculation the loc of octane. assume the lfl is 1.28 vol. %. [16b] when purging an octane tank it is desired to lower the oxygen concentration 40% below the loc. the initial oxygen concentration in the tank is 30 volume percent. a vacuum system capable of 290 mm hg abs. is available. assuming atmospheric pressure is 1 atm and the inert contains 1000 ppm oxygen. how many purging cycles does it take?

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

the answer is 75.0%.