A saturated liquid mixture of 0.4 mole fraction n-hexane and 0.6 mole fraction n-octane is fed at a rate of 100 moles/h to a distillation column. The column contains a total condenser and a regular reboiler. The reflux ratio at the top of the column is 0.5. The distillate product is 0.95 mole fraction n-hexane, and the mole fraction of n-hexane in the stream from the reboiler is 0.05. A cooling coil is submerged in the liquid of the second plate from the top of the column. The coil removes sufficient heat to condense 50 mol % of the vapor rising from plate 3. Constant molal overflow can be assumed. Determine the number of plates required and the location of the feed plate.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

the dissolution of polymer can be thermodynamically described in 2 steps.