I am working on a chemical bond lab and I need a little assistance on melting po

Question

I am working on a chemical bond lab and I need a little assistance on melting points

We are given...

Sucrose (C12H22O11)

Sodium Chloride (NaCl)

Stearic Acid (C18H10O6)

Corn Starch (C8H106)

Sodium Bicarbonate (NaHCO3)

- We are supposed to predict, and rank from 1-5 ("1" being the lowest melting point) the above mentioned chemical bonds. I know I can just "Google" their melting points, but I want to understand how the melting points are calculated. I already did the experiment and know that stearic acid melted the fast, and then sucrose, but the others don't have a melting point so I am clueless on how to rank these!

Explanation / Answer

friend i can say you that in case of organic compounds we can esily compare the boiling points just by simpplt calculating the molecular wts of the compounds the one with thye higher ml . wt has a higher boiling oint in comparison to the lower one .

by this we can easily compare the boiling points of organic compounds

and for NaCl and Na HCO3 we have to see whether the molecule is polar or we can see the dipole moment of the compounds and arrange them acc to their boiling points or we can smply calculate the lattice energy which is inversely proportional to the sizes of the cation + the anion

and i think that going by the concept of lattice energy is the best one in cale of ionic compounds

so in case of organic compounds the order is stearic > sucrose > corn > Nacl > NaHCO3

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