The chemical 1,4 – dichlorobenzene (1,4 – DCB) is sometimes used as a disinfectant in public lavatories, and has strong fragrance potential.

At 20°C (68°F) the vapor pressure (P), a measure of the gas phase concentration for 1,4-DCB, is 5.3 x 10-3 atm.

Gas phase 1,4-DCB concentration is also expressed as 3.2 g/m3.

(A) Estimate the Molecular Weight of 1,4-DCB (Please do not just report a value from the internet or other sources).

An alternative (an environmentally friendly but less fragrant) disinfection option is 1,bromo 4,chloro benzene (C6H4BrCl). Higher the molecular weight, higher the unit production cost.

(B) Which of the two disinfectants is a cheaper option for the end user? Higher the molecular weight, higher the unit production cost.