Homework Help: Chemistry

Posted by Anonymous on Monday, February 2, 2009 at 4:40pm.

Hexane is a hydrocarbon (a molecule containing only carbon and hydrogen) with a molecular weight of 86.18 g/mol,
a density of 0.660 g/mL, and a boiling point of 69C.

Pentanol is an alcohol (a hydrocarbon with a "OH" group attached to one of its carbons) with a molecular weight of
88.15 g/mol, a density of 0.814 g/mL, and a boiling point of 137C.

Calculate the volumes if 2.50 moles of each chemical is present.

Hexane: mL
?????
Pentanol: mL
??????
Think about this for the experiment you will perform in lab this week: You calculated the above volumes from the same number of molecules (moles). Why did you end up with two different volumes? The answer goes beyond the differences in the formula weights and densities.

Chemistry - bobpursley, Monday, February 2, 2009 at 5:06pm
Calculate the mass of 2.5moles of each.

Volume=mass/density
Chemistry - DrBob222, Monday, February 2, 2009 at 5:25pm
Here is a site about H bonding and water which should translate to the pentanol with no trouble.
http://www.nature.com/nature/journal/v173/n4408/abs/173774a0.html
Chemistry - Ally, Monday, May 4, 2009 at 7:15pm
Molecular Weight multiply by moles and divide by density is the answer!!

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