Monte Carlo simulations are reported for the distribution functions, t
he fraction of unbonded and bonded particles, and the pressure of a ch
emically associating fluid of hard discs of a circularly symmetric att
ractive square well. Depending on the choice of the bonding length, di
mers or chain molecules of different length can be formed. The depende
nce of the structural properties of the model on the fluid density and
association energy is discussed.