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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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ASJ ASJ
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12 years ago
I thought it was CnHn*2+2.
this works for cyclooctane but not for butane.
I drew out stick form of butane. Im confused.
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wrote...
#1
12 years ago
im in the same boat don't worry were all good at different things
wrote...
#2
12 years ago
For Cn, the correct answer for H is 2n+2.

Butane (C4) there would 10 H, or C4H10

Octane (C8) there would be 18 H or C8H18.

Cyclooctane is C8H16 (because of the presence of the ring, there is a loss of 2H bonds), so it doesn't fit.

Pull out your stick figure for butane again and see if maybe you were calculating correctly
wrote...
#3
12 years ago
For straight chain or branched chain alkanes, the formula is Cn H(2n+2) [ number of H atoms is two more than twice the number of carbon atoms.

For cyclic alkanes the formula is CnH2n [number of hydrogen atoms is twice the number of carbon atoms].
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