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?

Answer asap need it by wednesday morning carry out the following calculations on ph and ka of from data. i. calculate the ph of 0.02m hcl ii. calculate the ph of 0.036m naoh iii. calculate the ph of 0.36m ca(oh)2 iv. calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 v. calculate ka for weak acid ha which has a ph of 3.65 at 0.30m concentration vi. calculate the ka of a solution made by mixing 15.0 cm3 0.2m ha and 60.0 cm3 0.31m a-. [ph= 3.80] vii. calculate the ph of a solution made by mixing 15.0 cm3 0.1m naoh and 35.0 cm3 0.2m hcooh. [ka = 1.82 x 10-4 m]