Answer the following questions about two isomers, methyl methanoate and ethanoic acid. The molecular — Equilibrium Chemistry Question

Answer the following questions about two isomers, methyl methanoate and ethanoic acid. The molecular formula of the compounds is C₂H₄O₂.

A student puts 0.020 mol of methyl methanoate into a previously evacuated rigid 1.0 L vessel at 450 K. The pressure is measured to be 0.74 atm. When the experiment is repeated using 0.020 mol of ethanoic acid instead of methyl methanoate, the measured pressure is lower than 0.74 atm. The lower pressure for ethanoic acid is due to the following reversible reaction:

2 CH₃COOH(g) ⇌ (CH₃COOH)₂(g)