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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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smokebomb13 smokebomb13
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11 years ago
A litre of gasoline has a mass of approximately 850.9 grams. Assume that the molecular formula for gasoline in C6H14. So how many atoms would there be? And how do you figure that out? I've been struggling with this question for weeks!
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SmntnlSmntnl
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11 years ago
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#2
11 years ago
Hydrogen (H) has an atomic mass of 1 and Carbon (C) has an atomic mass of 12.  So, each Hexane molecule has an atomic mass of 72-14 or 86.  Using avogadro's number it takes 6.02x10^23 atoms to equal its atomic weight in grams.  My guess would be (850.9/86)x(6.02x10^23) or 5.95 x 10^24 mols of Hexane.  I'm blanking on if you'd just mutiply that by 20 to get the number of atoms though, I haven't had chemistry for the better part of 8 years or so.
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#3
11 years ago
850.9g/86g/mol=9.89mol
9.89mol*6.02*10^23=5.95*10^24 atoms

6.02*10^23 is constant value needs to remember.
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#4
11 years ago
Well, you convert the number of grams of gasoline into moles.
850.9 / (12.01*6+1.01*14) = 9.87 mol Hexane
Then you multiply the moles by Avogadro's Number for atoms per mole.
20*9.87 * (6.022*10^23) = 1.1887x 10^26 atoms in 1 Liter of hexane.  (20 because there are 20 atoms/molecule)
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