Ответ:

CH2=CH-CH3+H2O-->CH3- CH(OH) - CH3

CH3-C≡CH+H2-->CH3-CH=CH2

C6H5C2H5+CL2-->C6H5-CH(CL)-CH3+HCL

C+2H2-->CH4

2CH4-->C2H2+3H2

3C2H2-->C6H6

C6H6+3CL2-->C6H6CL6

дано

m прак (C6H5NO2) = 21 g

η(C6H5NO2) = 85.4%

--------------------------

m(C6H6) - ?

C6H6+HNO3-->C6H5NO2+H2O

m теор(C6H5NO2) = 21*100% / 85.4% = 24.59 g

M(C6H5NO2) = 123 g/mol

n(C6H5NO2) = m/M = 24.59 / 123 = 0.2 mol

n(C6H6) = n(C6H5NO2)

M(C6H6) = 78 g/mol

m(C6H6) = n*M = 0.2*78 =  15.6 g

ответ 15.6 гр

Объяснение: