Maleic acid is an organic compound composed of 41.39% C, 3.47% H, and the rest oxygen. If 0.129 mole of maleic acid has a mass of 15.0 g, what are the empirical and molecular formulas of maleic acid?

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Maleic acid is a carbon-hydrogen-oxygen compound used in dyeing and finishing fabrics and as a preservative of oils and fats. In combustion analysis, a 1.054-g sample of maleic acid yields 1.599 g of CO2 and 0.327 g of H2O. When 0.609 g of maleic acid is dissolved in 25.00 g of glacial acetic acid, the freezing point drops by 0.82 ∘C. Maleic acid does not ionize in glacial acetic acid, which has a freezing-point depression constant of Kf=3.90 ∘C/m. In a titration experiment, a 0.4250-g sample of maleic acid is dissolved in water and requires 34.03 mL of 0.2152 M KOH for its complete neutralization. The pH of 0.215 g of maleic acid in 50.00 mL of the aqueous solution is found to be 1.80.

Question: Determine the first ionization constant, K_a1, of maleic acid. Express your answer numerically using two significant figures.

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Maleic acid is a carbon-hydrogen-oxygen compound used in dyeing and finishing fabrics and as a preservative of oils and fats. In combustion analysis, a 1.054-g sample of maleic acid yields 1.599 g of CO₂ and 0.327 g of H₂O. When 0.609 g of maleic acid is dissolved in 25.00 g of glacial acetic acid, the freezing point drops by 0.82 °C. Maleic acid does not ionize in glacial acetic acid, which has a freezing-point depression constant of Kf=3.90 °C/m. In a titration experiment, a 0.4250-g sample of maleic acid is dissolved in water and requires 34.03 mL of 0.2152 M KOH for its complete neutralization. The pH of 0.215 g of maleic acid in 50.00 mL of the aqueous solution is found to be 1.80.

Question: Determine the first ionization constant, Ka1, of maleic acid. Express your answer numerically using two significant figures.