The bimolecular reaction H + Cl-2 --> HCl + Cl (1) is studied in the very low-pressure reactor (VLPR) system at room temperature. Excellent mass balances are found between the Cl-2 consumption and both HCl as well as Cl product formation. This indicates that only reaction 1 occurs in the system. Its rate constant is k(1) = (0.96 +/- 0.04) x 10(-11) cm(3)/(molecule.s) at 298 K. Two independent estimates of the A factor give a value log A(1)(298 K) = -9.80 +/- 0.15 (units of cm(3)/(molecules)). Together with the measured rate constant this yields an activation energy of 1.7 +/- 0.2 kcal/mol. All experimental data support a bent transition state for reaction 1.