First, consider that 1 mol of anything is 22.4L @ STP (standard temperature and pressure). Then consider that benzene's molecular weight is 78.11g/mol. So basically, 1 mol of benzene = 78.11g = 22.4L. Set up a simple proportion...
78.11g X grams
_____ = _______ X grams = 3.487 g or 3.49 grams (don't forget your sig figs!)
22.4L 1L
3102.8 grams per Wikipedia.
Regulations in the US and Europe limit the benzene content in gasoline to 1% by volume.
A blood test for benzene is one method that might be used to determine if an individual has been exposed to benzene and how much he might have been exposed to. As benzene leaves the blood quickly, another or other tests might also be considered.
If it is pure benzene and CCl4 your answer is; % Benzene = (m Benzene)/(m Total)*100 = 14.2 / (14.2 + 28) * 100 = 33.65 % If the solution is benzene and CCl4 dissolved in water or another solvent, the answer depends entirely on how much solvent you have.
Benzene has a lower boiling point than toluene because it has weaker intermoleclar forces. Benzene has a higher melting point than toluene because it is more symmetrical.
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