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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Tamer7 on January 30, 2019, 09:13:00 AM

Title: Organic question
Post by: Tamer7 on January 30, 2019, 09:13:00 AM
How can i get the value of ā€œnā€ for an aclcohol such that the percentage by mass of oxygen equals 21.6%?
Title: Re: Organic question
Post by: Borek on January 30, 2019, 09:21:27 AM
No idea which "n" (there is one obvious candidate, but in general question is pretty ambiguous), but the general approach is to express oxygen fraction as a function of "n" and to solve for the unknown.
Title: Re: Organic question
Post by: Vidya on February 04, 2019, 12:57:16 AM
How can i get the value of ā€œnā€ for an aclcohol such that the percentage by mass of oxygen equals 21.6%?
General formula of alkanol is CnH2n+1OH
So which means : CnH2n+2 O
If O is 21.6 % then remaining mass is due to C and H
Moles of carbon and H are in the ratio of
n:2n+2
Now use your algebra skill and mole concept of chemistry to solve it.