Question

Adipic acid, C6H10O4, is a raw material for the making of nylon and it can be prepared in the laboratory by the following reaction between cyclohexene, C6H10, and sodium dichromate, Na2Cr2O7 in sulphuric acid.
3 C6H10 + 4 Na2Cr2O7 + 16 H2SO4 >
3 C6H10O4 + 4 Cr2(SO4)3 + 4Na2SO4 + 16 H2O


To prepare 12.5 grams of adipic acid in 68.6% yield requires how many grams of cyclohexen

Answer 1

Mass of Cyclohexen : 10.2 g

Further explanation

Reaction

3 C6H10 + 4 Na2Cr2O7 + 16 H2SO4 >

3 C6H10O4 + 4 Cr2(SO4)3 + 4Na2SO4 + 16 H2O

mol C6H10 : mol C6H10O4 = 3 : 3 = 1 : 1

$\tt \%yield=\dfrac{actual}{theoretical}\times 100\%\\\\68.6\%=\dfrac{12.5}{theoretical}\times 100\%\\\\theoretical=18.22~g$

12.5 grams of C6H10O4 , mol C6H10O4 (MW 146.14 g/mol):

$\tt \dfrac{18.22}{148}=0.123$

mol C6H10 = mol C6H10O4 = 0.124

mass C6H10 :

$\tt 0.124\times 82.16=10.2~g$