An equilibrium mixture, at 594°C in a 1342-mL container, involving the chemical system
N2(g) + 3H2(g) 2NH3(g)
is found to contain 9.72 g of N2, 0.674 g of H2, and 0.385 g of NH3. Calculate the equilibrium constant (Keq expressed in terms of the molar concentrations) at the given temperature.