A quantity of liquid methanol, CH3OH, is introduced into a rigid 3.00-L vessel,...

Sara7

New member
...the vessel is sealed, and the? temperature is raised to 500K. At this temperature, the methanol vaporizes and decomposes according to the reaction CH3OH(g)<-->CO(g) + 2H2(g), Kc=6.90x 10^-2. If the concentration of H2 in the equilibrium mixture is .426M, what mass of methanol was initially introduced into the vessel?

The answer is: 74.3 g, but im not sure how to solve it.

THANK YOU!
 
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