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Chemistry questions! Cholesterol Questions! Please help! I have a test coming up!?

1) How many lone pairs are there in lewis structure of cholesterol?

2)How many sigma bonds are there?

3)How many methylene (CH2) groups are in the structure?

If i could get some help it would be greatly appreciated! thanks!

Thanks. But i still dont know how to get the number of sigma bonds?

Here is a picture of it! http://www.public.iastate.edu/~cfford/10...
and another:
http://upload.wikimedia.org/wikipedia/co...

It looks like there are two lone pairs on that Oxygen... everything else looks full.
So just count the methylene groups and sigma bonds!

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