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Chemistry help

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emi:
yes please i want that too

sweetsh:
The hydrogen percentage is 7.7% so the ratio is:
92.3 : 7.7
92.3/12 : 7.7/1
7.69:7.7
7.69/7.69:7.7/7.69

1:1

so the emprical formula is CH
and the molecular formula will be 78/13 *CH =6CH=C6H6

By the way I got this wrong in my mock exam but my teacher explained it to me. This exam was pretty hard!
Hope thats help!

june:
Oh i get the first part but i still dont get how u got the molecular formula.. where did  the 13 come from? ;s
Is there like an a formula thats used to work out the molecular formula i mean like speed= distance/time .. molecular formula= ?
Lol i dont know if im making any sense! and yeah its really hard, i hope we get an easy one!! :-\

SGVaibhav:
13 came from CH
u add the molar mass of elements
(12+1)

SGVaibhav:
http://www.crampuppy.com/1/IGCSE/chemistry/stoichiometry.shtml

read that.

i will tell u actual formula in sometime.
after reading it in my book!

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