At 500 °C, the decomposition of water into hydrogen and oxygen, as shown in the equation below, has Kc = 6.0 x 10⁻²⁸ .

2 H₂O(g) <---> 2H₂(g) + O₂(g)

The 5 L reaction vessel initially contained 0.015 mol H₂O. Calculate the concentrations of H₂ and O₂ at equilibrium.