17. Solving a chemistry problem

40.2 When analyzing a mixture of benzene, acetic acid and acetic anhydride, the absorption bands of benzene at 1.1 µm and of acetic acid at 1.92 and 1.1 µm are used. Absorption at these wavelengths of standard solutions was:
Parameter Benzene Acetic acid
W,% 30.0 40.0 50.0 10.0 30.0 40.0
Absorption at λ1.1,% 35.0 41.0 47.0 1.0 13.0 19.0
Absorption at λ1.92,% - - - 27.0 48.0 58.0
Determine the mass fraction (%) of benzene and acetic acid according to the following data:
Option 1
Absorption at λ1.1,% 45
Absorption at λ1.92,% 34