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 molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

What’s the scientific notation for the number 6,840,000,000

Straightforward questions answered in the powerpoint slidesreaction: heating the starting materials under refluxwhat does it mean to heat under reflux? why do we choose water as the reflux solvent? what are boiling chips used for? why do we put a condenser on top of the reaction? why do we add heat and let the reaction stir for 30 minutes? why do we add sulfuric acid to the reaction after it cools as opposed to when it’s still hot? separation: filtration of precipitatewhy don’t we do an aqueous and organic extraction in the separatory funnel? why do you rinse the salicylic acid on the filter with ice cold water? purification: recrystallization of salicylic acid (no hot filtration needed)what is the difference in the amount of room temperature water vs. boiling water needed to dissolve the salicylic acid (assume a 1.2 gram yield of salicylic acid)? remember, in the lab if you need x ml of boiling water to dissolve a solid, then you should add a little more (definitely no more than 1.5 times the theoretical amount) to ensure it doesn’t recrystallize prematurely.analysis: melting point of salicylic acidwhat can you conclude if the melting point of the salicylic acid you just synthesized is 152-155oc and the 1: 1 mix of your product and “synthetic” salicylic acid is 151-154oc?