A quantity of liquid Methanol, (CH3OH), is introduced into a rigid 3.00 L vessel, the vessel is sealed, and the temperature is raised to 500 degrees K. At this temperature, the Methanol vaporizes and decomposes according to the reaction:
CH3OH(g)-->CO(g) + 2H2(g), Kc = 6.90 x 10^2
If the concentration of Hydrogen gas (H2) in the equilibrium mixture is 0.426 M, what mass of Methanol was initially introduced into the vessel?