In a direct formic acid fuel cell, formic acid (HCOOH) is oxidised into carbon dioxide and...

In a direct formic acid fuel cell, formic acid (HCOOH) is oxidised into carbon dioxide and water over an alloy nanoparticle catalyst. The standard reduction potential for O2 is +1.23 V and for the reduction of CO2 to HCOOH is -0.25 V. (a) Write down balanced equations for each half-cell reaction and the overall cell reaction. Calculate the standard potential of the cell. (b) Under operating conditions, the concentration of HCOOH is 5.0 mol dm-3, and the pressures of O2 and CO2 are 3.4 and 1.9 bar respectively. Assuming ideal behaviour, calculate the operating voltage of the cell at 298 K. (c) If the entropy change for the reaction is +34.2 J K-1 mol-1, calculate the operating voltage of the cell at 353 K. Comment on the implications of your answers for the chosen operating conditions.

Expert Solution

queen_honey_blossom answered 1 year ago

Calculate the pH of a 0.500M formic acid (HCOOH) solution. Ka for formic acid is 1.8×10-4.

A solution of formic acid (HCOOH) has a pH of 2.11. How many grams of formic...

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An aqueous solution of formic acid, HCOOH, is prepared at 0.075 M. The acid-ionization constant is...

An aqueous solution of formic acid, HCOOH, is prepared at 0.075 M. The acid-ionization constant is Ka = 1.8 x 10-4. Because this is a weak acid, you may presume that the ionic strength is negligible (m = 0). Calculate: a) the pKa of HCOOH b) [H+] c) [HCOO-] d) [HCOOH] at equilibrium

Calculate the percent ionization of formic acid in a solution that is 0.010 M HCOOH and...

Calculate the percent ionization of formic acid in a solution that is 0.010 M HCOOH and 0.005 M HCOONa. Ka (HCOOH) = 1.7x10-4 ? 3.4% is correct answer

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Predict the vibrational contribution to the standard molar entropy of methanoic acid (formic acid, HCOOH) vapour at (i) 298 K (ii) 500 K. The normal modes occur at wavenumbers 3570, 2943, 1770, 1387, 1229, 1105, 625, 1033, 638 cm-1.

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What is the pH of a solution containing 10 g of HCOOH, formic acid dissolved in enough water to make 250 mL of solution?

1) At a pressure of 760 torr, formic acid (HCOOH; boiling point = 100.7 oC) and...

1) At a pressure of 760 torr, formic acid (HCOOH; boiling point = 100.7 oC) and water (H2O; boiling point = 100.0 oC) form an azeotropic mixture, boiling at 107.1 oC, that is 77.5% by mass formic acid. At the boiling point of the azeotrope (107.1 oC), the vapor pressure of pure formic acid is 917 torr, and that of pure water 974 torr. If the solution obeyed Raoult's law for both components, what would be the vapor pressure (in...

1) In a batch culture, formic acid (HCOOH) is produced using bacteria. For each mole of...

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Formic acid (HCOOH) is secreted by ants. Calculate [H3O+] for a 4.98E-2 M aqueous solution of...

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354 mL of 0.21 M formic acid HCOOH was mixed with 126 mL of 0.9 M...

354 mL of 0.21 M formic acid HCOOH was mixed with 126 mL of 0.9 M NaOH. What will be the final pH?

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