A Quantity of Liquid Methanol, CH₃OH, Is Introduced into a Rigid

question 101

Multiple Choice

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 K. At this temperature, the methanol vaporizes and decomposes according to the reaction CH₃OH(g) CO(g) + 2 H₂(g) , K_c = 6.90 × 10^-2
If the concentration of H₂ in the equilibrium mixture is 0.426 M, what mass of methanol was initially introduced into the vessel?

• A) 147 g
• B) 74.3 g
• C) 33.9 g
• D) 49.0 g
• E) 24.8 g

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