At 500 °C hydrogen iodide decomposes according to

2HI (g) ⇌ H2 (g) + I2 (g)

For HI(g) heated to 500 °C in a 1.00-L reaction vessel, chemical analysis determined the following concentrations at equilibrium: [H2] = 0.404 M, [I2] = 0.468 M, and [HI] = 3.41 M. If an additional 1.00 mole of HI(g) is introduced into the reaction vessel, what are the equilibrium concentrations after the new equilibrium has been reached?