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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: realdon on February 23, 2008, 11:41:41 PM

Title: Isomers of C3H6Cl2
Post by: realdon on February 23, 2008, 11:41:41 PM

What is the total number of isomers for a compound with molecular formula C3H6Cl2?

This is a easy question and I got 4 of them. The ones I drew out is in this link.
http://webbook.nist.gov/cgi/cbook.cgi?Formula=C3H6Cl2&NoIon=on&Units=SI

But the answer says that there are 5 of them....is this a typo or am I missing something?

THanks a lot

Title: Re: Isomers of C3H6Cl2
Post by: Yggdrasil on February 24, 2008, 01:07:39 AM

One of the isomers has two stereoisomers.

Title: Re: Isomers of C3H6Cl2
Post by: realdon on February 24, 2008, 02:31:29 PM

Right, Right, forgot about that...Thanks a lot

Can you look at another question?
A certain element, X, reacts with sulfur to form the compound X2S5 If 0.274 g of the element form 0.568 g of the compound, what is the atomic molar mass of the element?
A 31.0 g mol
B 58.9 g mol
C 65.4 g mol
D 74.7 g mol
E 121.8 g mol

I don't know what I did wrong here but the correct answer is B but I got D.

let x= molar mass of X
moles of element X = 2(moles of compound X2S5)
0.274/x = 2(0.568/(2x+5(32.065)))
x=74.7

Title: Re: Isomers of C3H6Cl2
Post by: Yggdrasil on February 24, 2008, 04:07:10 PM

I also get 74.7g/mol as the answer.  Perhaps it's a typo in the answer key.

Title: Re: Isomers of C3H6Cl2
Post by: realdon on February 24, 2008, 07:35:35 PM

Thanks a lot Yggdrasil.