"The equilibrium constant for the following reaction has the value 2.1*10^3 at a particular temperature.
H2(g) + F2(g) 2 HF(g)
When the system is analyzed at equilibrium at this temperature, the concentrations of both H2(g) and F2(g) are found to be 0.0050 M. What is the concentration of HF(g) in the equilibrium system under these conditions?