Dear

**TheWall04**;

**Sorry!** – You selected the

**wrong** 50%, because you must use the mola

**L**ity and not the mola

**R**ity.

And the Mola

**L**ity is defined as the “numbers” of moles per 1000 grams.

So from the definition of mola

**L**ity it follows for your “

**m**” in your case:

“**m**” = (m_{?} / M_{?}) / m_{B} * 1000g

With: m

_{?} = mass of the unknown; M

_{?} = Molecular weight of the unknown.

m

_{B} = mass of Benzene

Now you have only to rearrange this equation to M

_{?} = … and you can calculate your preferred Molecular weight. With the use of the ratios (from the element analysis) you can calculate finaly the summformula and tell the name of the unknowned compound.

Do you think it is still too difficalt for you?

(Is now the difference between ‘

**R**’ and ‘

**L**’ Business also clear to you?)

Good Luck!

ARGOS

^{++}