# Chemistry UV-vis spectrophotometer problem

Benzene (C6H6) has been used to remove water from ethanol by azeotropic distillation.
A sample is analysed in a UV-vis spectrophotometer which gives a reading of 0.0075 absorbance units, when using a path length, l, of 1cm. The solvent can only be used if the concentration of benzene is less than 0.25ppm. Determine if this batch of solvent is acceptable.

Data for benzene: λmax = 207nm; ε = 7450 Lcm^-1mol^-1
Data for ethanol: ρ = 0.79gcm^-3

[10 marks]
(edited 1 week ago)
Original post by lizancol
Benzene (C6H6) has been used to remove water from ethanol by azeotropic distillation.
A sample is analysed in a UV-vis spectrophotometer which gives a reading of 0.0075 absorbance units, when using a path length, l, of 1cm. The solvent can only be used if the concentration of benzene is less than 0.25ppm. Determine if this batch of solvent is acceptable.

Data for benzene: λmax = 207nm; ε = 7450 Lcm^-1mol^-1
Data for ethanol: ρ = 0.79gcm^-3

[10 marks]