– You selected the wrong
50%, because you must use the molaL
ity and not the molaR
And the MolaL
ity is defined as the “numbers” of moles per 1000 grams.
So from the definition of molaL
ity it follows for your “m
” in your case:
“m” = (m? / M?) / mB * 1000g
= mass of the unknown; M?
= Molecular weight of the unknown.
= 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?)